refactor: remove orphaned compaction-context-injector hook

Hook was disconnected from plugin flow since commit 4a82ff40.
Never called at runtime, superseded by preemptive-compaction hook.

src/hooks/compaction-context-injector/index.ts

@@ -1,76 +0,0 @@
-import { injectHookMessage } from "../../features/hook-message-injector"
-import { log } from "../../shared/logger"
-import { createSystemDirective, SystemDirectiveTypes } from "../../shared/system-directive"
-
-export interface SummarizeContext {
-  sessionID: string
-  providerID: string
-  modelID: string
-  usageRatio: number
-  directory: string
-}
-
-const SUMMARIZE_CONTEXT_PROMPT = `${createSystemDirective(SystemDirectiveTypes.COMPACTION_CONTEXT)}
-
-When summarizing this session, you MUST include the following sections in your summary:
-
-## 1. User Requests (As-Is)
-- List all original user requests exactly as they were stated
-- Preserve the user's exact wording and intent
-
-## 2. Final Goal
-- What the user ultimately wanted to achieve
-- The end result or deliverable expected
-
-## 3. Work Completed
-- What has been done so far
-- Files created/modified
-- Features implemented
-- Problems solved
-
-## 4. Remaining Tasks
-- What still needs to be done
-- Pending items from the original request
-- Follow-up tasks identified during the work
-
-## 5. Active Working Context (For Seamless Continuation)
-- **Files**: Paths of files currently being edited or frequently referenced
-- **Code in Progress**: Key code snippets, function signatures, or data structures under active development
-- **External References**: Documentation URLs, library APIs, or external resources being consulted
-- **State & Variables**: Important variable names, configuration values, or runtime state relevant to ongoing work
-
-## 6. MUST NOT Do (Critical Constraints)
-- Things that were explicitly forbidden
-- Approaches that failed and should not be retried
-- User's explicit restrictions or preferences
-- Anti-patterns identified during the session
-
-## 7. Agent Verification State (Critical for Reviewers)
-- **Current Agent**: What agent is running (momus, oracle, etc.)
-- **Verification Progress**: Files already verified/validated
-- **Pending Verifications**: Files still needing verification
-- **Previous Rejections**: If reviewer agent, what was rejected and why
-- **Acceptance Status**: Current state of review process
-
-This section is CRITICAL for reviewer agents (momus, oracle) to maintain continuity.
-
-This context is critical for maintaining continuity after compaction.
-`
-
-export function createCompactionContextInjector() {
-  return async (ctx: SummarizeContext): Promise<void> => {
-    log("[compaction-context-injector] injecting context", { sessionID: ctx.sessionID })
-
-    const success = injectHookMessage(ctx.sessionID, SUMMARIZE_CONTEXT_PROMPT, {
-      agent: "general",
-      model: { providerID: ctx.providerID, modelID: ctx.modelID },
-      path: { cwd: ctx.directory },
-    })
-
-    if (success) {
-      log("[compaction-context-injector] context injected", { sessionID: ctx.sessionID })
-    } else {
-      log("[compaction-context-injector] injection failed", { sessionID: ctx.sessionID })
-    }
-  }
-}