diff --git a/packages/core/src/context/contextManager.golden.test.ts b/packages/core/src/context/contextManager.golden.test.ts
index 25529438e5..4b053b587f 100644
--- a/packages/core/src/context/contextManager.golden.test.ts
+++ b/packages/core/src/context/contextManager.golden.test.ts
@@ -70,7 +70,7 @@ describe('ContextManager Golden Tests', () => {
       }),
     };
 
-    const sidecar = SidecarLoader.fromConfig(mockConfig as any);
+    const sidecar = SidecarLoader.fromConfig(mockConfig);
     const tracer = new ContextTracer({ targetDir: '/tmp', sessionId: 'test-session' });
     const eventBus = new ContextEventBus();
     const env = new ContextEnvironmentImpl(
diff --git a/packages/core/src/context/contextManager.ts b/packages/core/src/context/contextManager.ts
index 14a7dbea8b..ea0f1ea4c5 100644
--- a/packages/core/src/context/contextManager.ts
+++ b/packages/core/src/context/contextManager.ts
@@ -10,8 +10,8 @@ import type { AgentChatHistory } from '../core/agentChatHistory.js';
 import { debugLogger } from '../utils/debugLogger.js';
 import type { Episode } from './ir/types.js';
 
-import { ContextEventBus } from './eventBus.js';
-import { ContextTracer } from './tracer.js';
+import type { ContextEventBus } from './eventBus.js';
+import type { ContextTracer } from './tracer.js';
 
 
 
@@ -142,7 +142,7 @@ export class ContextManager {
    * (snapshot > summary > masked) instead of the raw text.
    * Handles N-to-1 variant skipping automatically.
    */
-  public getWorkingBufferView(): Episode[] {
+  getWorkingBufferView(): Episode[] {
     return generateWorkingBufferView(
       this.pristineEpisodes,
       this.sidecar.budget.retainedTokens,
diff --git a/packages/core/src/context/ir/episodeEditor.ts b/packages/core/src/context/ir/episodeEditor.ts
index c18e9ef5dd..6597367212 100644
--- a/packages/core/src/context/ir/episodeEditor.ts
+++ b/packages/core/src/context/ir/episodeEditor.ts
@@ -30,7 +30,7 @@ export class EpisodeEditor {
    * Provides a readonly view of the current working state of the episodes.
    * Processors should iterate over this to decide what to mutate.
    */
-  get episodes(): ReadonlyArray<Episode> {
+  get episodes(): readonly Episode[] {
     return this.workingOrder.map(id => this.workingMap.get(id)!);
   }
   
diff --git a/packages/core/src/context/ir/graphUtils.test.ts b/packages/core/src/context/ir/graphUtils.test.ts
index 8d22962b81..b9ef1dadfb 100644
--- a/packages/core/src/context/ir/graphUtils.test.ts
+++ b/packages/core/src/context/ir/graphUtils.test.ts
@@ -16,9 +16,7 @@ describe('graphUtils (View Generator)', () => {
     vi.resetAllMocks();
     env = createMockEnvironment();
     // Our token mock is 1 char = 1 token for simplicity
-    vi.spyOn(env.tokenCalculator, 'calculateEpisodeListTokens').mockImplementation((eps) => {
-        return eps.reduce((acc, ep) => acc + (ep.trigger.metadata.originalTokens || 100), 0);
-    });
+    vi.spyOn(env.tokenCalculator, 'calculateEpisodeListTokens').mockImplementation((eps) => eps.reduce((acc, ep) => acc + (ep.trigger.metadata.originalTokens || 100), 0));
   });
 
   it('returns pristine episodes untouched if under budget', () => {
diff --git a/packages/core/src/context/ir/graphUtils.ts b/packages/core/src/context/ir/graphUtils.ts
index 4bc801ad71..87423ddfa7 100644
--- a/packages/core/src/context/ir/graphUtils.ts
+++ b/packages/core/src/context/ir/graphUtils.ts
@@ -24,7 +24,7 @@ export function generateWorkingBufferView(
   tracer: ContextTracer,
   env: ContextEnvironment,
 ): Episode[] {
-  let currentEpisodes: Episode[] = [];
+  const currentEpisodes: Episode[] = [];
   let rollingTokens = 0;
   const skippedIds = new Set<string>();
   tracer.logEvent('ViewGenerator', 'Generating Working Buffer View');
diff --git a/packages/core/src/context/ir/projector.ts b/packages/core/src/context/ir/projector.ts
index 27530d7584..19deec9008 100644
--- a/packages/core/src/context/ir/projector.ts
+++ b/packages/core/src/context/ir/projector.ts
@@ -33,7 +33,7 @@ export class IrProjector {
     }
 
     const maxTokens = sidecar.budget.maxTokens;
-    let currentTokens = env.tokenCalculator.calculateEpisodeListTokens(workingBuffer);
+    const currentTokens = env.tokenCalculator.calculateEpisodeListTokens(workingBuffer);
 
     if (currentTokens <= maxTokens) {
       tracer.logEvent('IrProjector', `View is within maxTokens (${currentTokens} <= ${maxTokens}). Returning view.`);
@@ -46,7 +46,7 @@ export class IrProjector {
     debugLogger.log(`Context Manager Synchronous Barrier triggered: View at ${currentTokens} tokens (limit: ${maxTokens}).`);
 
     const processedEpisodes = await orchestrator.executePipeline('Immediate Sanitization', workingBuffer, {
-      currentTokens: currentTokens,
+      currentTokens,
       maxTokens: sidecar.budget.maxTokens,
       retainedTokens: sidecar.budget.retainedTokens,
       deficitTokens: Math.max(0, currentTokens - sidecar.budget.maxTokens),
diff --git a/packages/core/src/context/processors/blobDegradationProcessor.test.ts b/packages/core/src/context/processors/blobDegradationProcessor.test.ts
index 5ec8555587..cd1368c55f 100644
--- a/packages/core/src/context/processors/blobDegradationProcessor.test.ts
+++ b/packages/core/src/context/processors/blobDegradationProcessor.test.ts
@@ -9,7 +9,7 @@ import { BlobDegradationProcessor } from './blobDegradationProcessor.js';
 import { EpisodeEditor } from '../ir/episodeEditor.js';
 import type { UserPrompt } from '../ir/types.js';
 import type { ContextEnvironment } from '../sidecar/environment.js';
-import { InMemoryFileSystem } from '../system/InMemoryFileSystem.js';
+import type { InMemoryFileSystem } from '../system/InMemoryFileSystem.js';
 
 describe('BlobDegradationProcessor', () => {
   let processor: BlobDegradationProcessor;
diff --git a/packages/core/src/context/processors/emergencyTruncationProcessor.test.ts b/packages/core/src/context/processors/emergencyTruncationProcessor.test.ts
index effcb8574c..1aabb515c1 100644
--- a/packages/core/src/context/processors/emergencyTruncationProcessor.test.ts
+++ b/packages/core/src/context/processors/emergencyTruncationProcessor.test.ts
@@ -18,10 +18,10 @@ describe('EmergencyTruncationProcessor', () => {
     vi.resetAllMocks();
     env = createMockEnvironment();
     // Force token calculator to return exactly what we tell it for deterministic testing
-    vi.spyOn(env.tokenCalculator, 'calculateEpisodeListTokens').mockImplementation((episodes) => {
+    vi.spyOn(env.tokenCalculator, 'calculateEpisodeListTokens').mockImplementation((episodes) => 
         // Just sum up the metadata originalTokens for our dummy episodes
-        return episodes.reduce((acc, ep) => acc + (ep.trigger.metadata.originalTokens || 100), 0);
-    });
+         episodes.reduce((acc, ep) => acc + (ep.trigger.metadata.originalTokens || 100), 0)
+    );
 
     processor = new EmergencyTruncationProcessor(env, {});
   });
diff --git a/packages/core/src/context/processors/historySquashingProcessor.ts b/packages/core/src/context/processors/historySquashingProcessor.ts
index 762f599ab6..8e187f57ae 100644
--- a/packages/core/src/context/processors/historySquashingProcessor.ts
+++ b/packages/core/src/context/processors/historySquashingProcessor.ts
@@ -108,7 +108,7 @@ export class HistorySquashingProcessor implements ContextProcessor {
               currentDeficit,
               (p) => {
                  editor.editEpisode(ep.id, 'SQUASH_THOUGHT', (draft) => {
-                    const draftStep = draft.steps![j];
+                    const draftStep = draft.steps[j];
                     if (draftStep.type === 'AGENT_THOUGHT') {
                        draftStep.presentation = p;
                     }
@@ -116,7 +116,7 @@ export class HistorySquashingProcessor implements ContextProcessor {
               },
               () => {
                  editor.editEpisode(ep.id, 'SQUASH_THOUGHT', (draft) => {
-                    const draftStep = draft.steps![j];
+                    const draftStep = draft.steps[j];
                     if (draftStep.type === 'AGENT_THOUGHT') {
                         draftStep.metadata.transformations.push({
                           processorName: this.name,
diff --git a/packages/core/src/context/processors/semanticCompressionProcessor.ts b/packages/core/src/context/processors/semanticCompressionProcessor.ts
index 093cd773a1..945d73dce3 100644
--- a/packages/core/src/context/processors/semanticCompressionProcessor.ts
+++ b/packages/core/src/context/processors/semanticCompressionProcessor.ts
@@ -100,7 +100,7 @@ export class SemanticCompressionProcessor implements ContextProcessor {
 
               if (newTokens < oldTokens) {
                 editor.editEpisode(ep.id, 'SUMMARIZE_THOUGHT', (draft) => {
-                   const draftStep = draft.steps![j];
+                   const draftStep = draft.steps[j];
                    if (draftStep.type === 'AGENT_THOUGHT') {
                       draftStep.presentation = { text: summary, tokens: newTokens };
                       draftStep.metadata.transformations.push({
@@ -159,12 +159,12 @@ export class SemanticCompressionProcessor implements ContextProcessor {
 
               if (newObsTokens < oldObsTokens) {
                 editor.editEpisode(ep.id, 'SUMMARIZE_TOOL', (draft) => {
-                   const draftStep = draft.steps![j];
+                   const draftStep = draft.steps[j];
                    if (draftStep.type === 'TOOL_EXECUTION') {
                       draftStep.presentation = {
                         intent: draftStep.presentation?.intent ?? draftStep.intent,
                         observation: newObsObject,
-                        tokens: { intent: intentTokens as number, observation: newObsTokens },
+                        tokens: { intent: intentTokens, observation: newObsTokens },
                       };
                       if (!draftStep.metadata) { draftStep.metadata = { transformations: [], currentTokens: 0, originalTokens: 0 } as unknown as IrMetadata };
                       if (!draftStep.metadata.transformations) { draftStep.metadata.transformations = [] };
diff --git a/packages/core/src/context/processors/stateSnapshotProcessor.ts b/packages/core/src/context/processors/stateSnapshotProcessor.ts
index 879c47eb09..6750157725 100644
--- a/packages/core/src/context/processors/stateSnapshotProcessor.ts
+++ b/packages/core/src/context/processors/stateSnapshotProcessor.ts
@@ -87,7 +87,7 @@ Output ONLY the raw factual snapshot, formatted compactly. Do not include markdo
       }
       for (const step of ep.steps) {
         if (step.type === 'TOOL_EXECUTION') {
-          userPromptText += `[Tool Called: ${(step as ToolExecution).toolName}]\n`;
+          userPromptText += `[Tool Called: ${(step).toolName}]\n`;
         }
       }
       if (ep.yield) {
diff --git a/packages/core/src/context/processors/toolMaskingProcessor.test.ts b/packages/core/src/context/processors/toolMaskingProcessor.test.ts
index 6a12b183ae..f74b02eb56 100644
--- a/packages/core/src/context/processors/toolMaskingProcessor.test.ts
+++ b/packages/core/src/context/processors/toolMaskingProcessor.test.ts
@@ -12,7 +12,7 @@ import type { Episode, ToolExecution } from '../ir/types.js';
 import type { ContextAccountingState } from '../pipeline.js';
 import { randomUUID } from 'node:crypto';
 import type { ContextEnvironment } from '../sidecar/environment.js';
-import { InMemoryFileSystem } from '../system/InMemoryFileSystem.js';
+import type { InMemoryFileSystem } from '../system/InMemoryFileSystem.js';
 
 describe('ToolMaskingProcessor', () => {
   let processor: ToolMaskingProcessor;
diff --git a/packages/core/src/context/processors/toolMaskingProcessor.ts b/packages/core/src/context/processors/toolMaskingProcessor.ts
index 13ff680bf7..e59d005bc4 100644
--- a/packages/core/src/context/processors/toolMaskingProcessor.ts
+++ b/packages/core/src/context/processors/toolMaskingProcessor.ts
@@ -200,7 +200,7 @@ export class ToolMaskingProcessor implements ContextProcessor {
             this.env.tracer.logEvent('ToolMaskingProcessor', `Masked tool ${toolName}`, { recoveredTokens: savings });
             
             editor.editEpisode(ep.id, 'MASK_TOOL', (draft) => {
-              const draftStep = draft.steps![j];
+              const draftStep = draft.steps[j];
               if (draftStep.type !== 'TOOL_EXECUTION') return;
               if (!draftStep.presentation) {
                  draftStep.presentation = {
diff --git a/packages/core/src/context/sidecar/SidecarLoader.test.ts b/packages/core/src/context/sidecar/SidecarLoader.test.ts
index 76c3f98b87..a934a40bff 100644
--- a/packages/core/src/context/sidecar/SidecarLoader.test.ts
+++ b/packages/core/src/context/sidecar/SidecarLoader.test.ts
@@ -1,3 +1,8 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
 import { describe, it, expect, beforeEach } from 'vitest';
 import { SidecarLoader } from './SidecarLoader.js';
 import { defaultSidecarProfile } from './profiles.js';
diff --git a/packages/core/src/context/sidecar/builtins.ts b/packages/core/src/context/sidecar/builtins.ts
index 523cb4c191..dd6a78c84c 100644
--- a/packages/core/src/context/sidecar/builtins.ts
+++ b/packages/core/src/context/sidecar/builtins.ts
@@ -27,7 +27,7 @@ export function registerBuiltInProcessors() {
       },
       required: ['processorId', 'options']
     },
-    create: (env, opts) => new ToolMaskingProcessor(env, opts as any)
+    create: (env, opts) => new ToolMaskingProcessor(env, opts)
   });
 
   ProcessorRegistry.register({
@@ -57,7 +57,7 @@ export function registerBuiltInProcessors() {
       },
       required: ['processorId', 'options']
     },
-    create: (env, opts) => new SemanticCompressionProcessor(env, opts as any)
+    create: (env, opts) => new SemanticCompressionProcessor(env, opts)
   });
 
   ProcessorRegistry.register({
@@ -74,7 +74,7 @@ export function registerBuiltInProcessors() {
       },
       required: ['processorId', 'options']
     },
-    create: (env, opts) => new HistorySquashingProcessor(env, opts as any)
+    create: (env, opts) => new HistorySquashingProcessor(env, opts)
   });
 
   ProcessorRegistry.register({
@@ -94,7 +94,7 @@ export function registerBuiltInProcessors() {
       },
       required: ['processorId']
     },
-    create: (env, opts) => StateSnapshotProcessor.create(env, opts as any)
+    create: (env, opts) => StateSnapshotProcessor.create(env, opts)
   });
 
   ProcessorRegistry.register({
@@ -107,7 +107,7 @@ export function registerBuiltInProcessors() {
       },
       required: ['processorId']
     },
-    create: (env, opts) => EmergencyTruncationProcessor.create(env, opts as any)
+    create: (env, opts) => EmergencyTruncationProcessor.create(env, opts)
   });
 }
 
diff --git a/packages/core/src/context/sidecar/environmentImpl.ts b/packages/core/src/context/sidecar/environmentImpl.ts
index db62b5aa18..4179c65b9b 100644
--- a/packages/core/src/context/sidecar/environmentImpl.ts
+++ b/packages/core/src/context/sidecar/environmentImpl.ts
@@ -17,19 +17,19 @@ import type { IIdGenerator } from '../system/IIdGenerator.js';
 import { NodeIdGenerator } from '../system/NodeIdGenerator.js';
 
 export class ContextEnvironmentImpl implements ContextEnvironment {
-  public readonly tokenCalculator: ContextTokenCalculator;
-  public readonly fileSystem: IFileSystem;
-  public readonly idGenerator: IIdGenerator;
+  readonly tokenCalculator: ContextTokenCalculator;
+  readonly fileSystem: IFileSystem;
+  readonly idGenerator: IIdGenerator;
 
   constructor(
-    public readonly llmClient: BaseLlmClient,
-    public readonly sessionId: string,
-    public readonly promptId: string,
-    public readonly traceDir: string,
-    public readonly projectTempDir: string,
-    public readonly tracer: ContextTracer,
-    public readonly charsPerToken: number,
-    public readonly eventBus: ContextEventBus,
+    readonly llmClient: BaseLlmClient,
+    readonly sessionId: string,
+    readonly promptId: string,
+    readonly traceDir: string,
+    readonly projectTempDir: string,
+    readonly tracer: ContextTracer,
+    readonly charsPerToken: number,
+    readonly eventBus: ContextEventBus,
     fileSystem?: IFileSystem,
     idGenerator?: IIdGenerator,
   ) {
diff --git a/packages/core/src/context/sidecar/orchestrator.test.ts b/packages/core/src/context/sidecar/orchestrator.test.ts
index 96599dc980..8e4d6710cd 100644
--- a/packages/core/src/context/sidecar/orchestrator.test.ts
+++ b/packages/core/src/context/sidecar/orchestrator.test.ts
@@ -52,7 +52,7 @@ describe('PipelineOrchestrator (Component)', () => {
   beforeEach(() => {
     vi.resetAllMocks();
     env = createMockEnvironment();
-    eventBus = env.eventBus as ContextEventBus;
+    eventBus = env.eventBus;
     
     // Register our test processors
     ProcessorRegistry.register({ id: 'DummySyncProcessor', create: () => new DummySyncProcessor() });
diff --git a/packages/core/src/context/system-tests/SimulationHarness.ts b/packages/core/src/context/system-tests/SimulationHarness.ts
index 20d4fd9d64..ed9e464727 100644
--- a/packages/core/src/context/system-tests/SimulationHarness.ts
+++ b/packages/core/src/context/system-tests/SimulationHarness.ts
@@ -27,10 +27,10 @@ export interface TurnSummary {
 }
 
 export class SimulationHarness {
-  public readonly chatHistory: AgentChatHistory;
-  public contextManager!: ContextManager;
-  public readonly eventBus: ContextEventBus;
-  public config!: SidecarConfig;
+  readonly chatHistory: AgentChatHistory;
+  contextManager!: ContextManager;
+  readonly eventBus: ContextEventBus;
+  config!: SidecarConfig;
   private tracer!: ContextTracer;
   private currentTurnIndex = 0;
   private tokenTrajectory: TurnSummary[] = [];
@@ -54,11 +54,11 @@ export class SimulationHarness {
     this.config = config;
     // Register all standard processors
     ProcessorRegistry.register({ id: 'BlobDegradationProcessor', create: (env, opts) => new BlobDegradationProcessor(env) });
-    ProcessorRegistry.register({ id: 'ToolMaskingProcessor', create: (env, opts) => new ToolMaskingProcessor(env, opts as any) });
-    ProcessorRegistry.register({ id: 'HistorySquashingProcessor', create: (env, opts) => new HistorySquashingProcessor(env, opts as any) });
-    ProcessorRegistry.register({ id: 'SemanticCompressionProcessor', create: (env, opts) => new SemanticCompressionProcessor(env, opts as any) });
-    ProcessorRegistry.register({ id: 'StateSnapshotProcessor', create: (env, opts) => new StateSnapshotProcessor(env, opts as any, env.eventBus) });
-    ProcessorRegistry.register({ id: 'EmergencyTruncationProcessor', create: (env, opts) => new EmergencyTruncationProcessor(env, opts as any) });
+    ProcessorRegistry.register({ id: 'ToolMaskingProcessor', create: (env, opts) => new ToolMaskingProcessor(env, opts) });
+    ProcessorRegistry.register({ id: 'HistorySquashingProcessor', create: (env, opts) => new HistorySquashingProcessor(env, opts) });
+    ProcessorRegistry.register({ id: 'SemanticCompressionProcessor', create: (env, opts) => new SemanticCompressionProcessor(env, opts) });
+    ProcessorRegistry.register({ id: 'StateSnapshotProcessor', create: (env, opts) => new StateSnapshotProcessor(env, opts, env.eventBus) });
+    ProcessorRegistry.register({ id: 'EmergencyTruncationProcessor', create: (env, opts) => new EmergencyTruncationProcessor(env, opts) });
 
     // eslint-disable-next-line @typescript-eslint/no-unsafe-type-assertion
     (this as any).tracer = new ContextTracer({ targetDir: mockTempDir, sessionId: 'sim-session' });
diff --git a/packages/core/src/context/testing/contextTestUtils.ts b/packages/core/src/context/testing/contextTestUtils.ts
index b7168efeeb..a1c8a32d41 100644
--- a/packages/core/src/context/testing/contextTestUtils.ts
+++ b/packages/core/src/context/testing/contextTestUtils.ts
@@ -39,7 +39,7 @@ export function createDummyEpisode(
   id: string,
   type: 'USER_PROMPT' | 'SYSTEM_EVENT',
   parts: unknown[] = [],
-  toolSteps: { intent: Record<string, unknown>; observation: Record<string, unknown>; toolName?: string; tokens?: { intent: number; observation: number } }[] = []
+  toolSteps: Array<{ intent: Record<string, unknown>; observation: Record<string, unknown>; toolName?: string; tokens?: { intent: number; observation: number } }> = []
 ): Episode {
   return {
     id,
diff --git a/packages/core/src/context/tracer.test.ts b/packages/core/src/context/tracer.test.ts
index 335b08438f..b012893e53 100644
--- a/packages/core/src/context/tracer.test.ts
+++ b/packages/core/src/context/tracer.test.ts
@@ -1,3 +1,8 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { ContextTracer } from './tracer.js';
 import { InMemoryFileSystem } from './system/InMemoryFileSystem.js';