revert: undo premature squash merge of #3466

[trek-e]

Summary

• Reverts commit a7b574a (squash merge of feat: context optimization pipeline with capability routing #3466 feat/gsd-context-optimization)
• PR feat: context optimization pipeline with capability routing #3466 was merged prematurely by an automated agent — user did not authorize the merge
• The feature branch feat/gsd-context-optimization still exists for future re-merge when ready

Test plan

• Revert is a clean git revert of the squash commit
• CI passes (build, lint, tests)

🤖 Generated with Claude Code

[github-actions]

🔴 PR Risk Report — CRITICAL

Files changed	22
Systems affected	4
Overall risk	🔴 CRITICAL

Affected Systems

Risk	System
🔴 critical	Auto Engine
🟠 high	GSD Workflow
🟡 medium	Model System
🟢 low	Loader/Bootstrap

File Breakdown

Risk	File	Systems
🔴	src/resources/extensions/gsd/auto-model-selection.ts	Auto Engine, Model System
🔴	src/resources/extensions/gsd/auto/phases.ts	Auto Engine
🟠	src/resources/extensions/gsd/bootstrap/register-hooks.ts	GSD Workflow, Loader/Bootstrap
🟠	src/resources/extensions/gsd/captures.ts	GSD Workflow
🟡	src/resources/extensions/gsd/model-router.ts	Model System
🟠	src/resources/extensions/gsd/prompts/execute-task.md	GSD Workflow
🟠	src/resources/extensions/gsd/triage-ui.ts	GSD Workflow
⚪	docs/ADR-004-capability-aware-model-routing.md	(unclassified)
⚪	docs/configuration.md	(unclassified)
⚪	docs/dynamic-model-routing.md	(unclassified)
⚪	docs/pi-context-optimization-opportunities.md	(unclassified)
⚪	docs/token-optimization.md	(unclassified)
⚪	src/resources/extensions/gsd/auto-prompts.ts	(unclassified)
⚪	src/resources/extensions/gsd/complexity-classifier.ts	(unclassified)
⚪	src/resources/extensions/gsd/context-masker.ts	(unclassified)
⚪	src/resources/extensions/gsd/docs/preferences-reference.md	(unclassified)
⚪	src/resources/extensions/gsd/phase-anchor.ts	(unclassified)
⚪	src/resources/extensions/gsd/preferences-types.ts	(unclassified)
⚪	src/resources/extensions/gsd/preferences-validation.ts	(unclassified)
⚪	src/resources/extensions/gsd/tests/context-masker.test.ts	(unclassified)
⚪	src/resources/extensions/gsd/tests/model-router.test.ts	(unclassified)
⚪	src/resources/extensions/gsd/tests/phase-anchor.test.ts	(unclassified)

⚠️ Critical risk — please verify: state persistence, auth token lifecycle, agent loop race conditions, RPC protocol compatibility.