Temporarily remove AI summary feature (issue #20)

[MelbourneDeveloper]

TLDR

Temporarily rips out the Copilot-powered AI summary feature so it cannot silently consume Copilot quota — closes the regression reported in #20. Discovery, registration, tagging, Quick Launch, and execution are unchanged.

Details

Removed entirely:

• src/semantic/summariser.ts (Copilot model selection, request fan-out, tool-calling) — 297 lines deleted
• src/semantic/modelSelection.ts (auto-pick logic that landed on the first available model, often Claude Opus) — 106 lines deleted
• src/test/e2e/aisummaries.e2e.test.ts and src/test/unit/modelSelection.unit.test.ts — tests for the removed code

Trimmed:

• src/semantic/summaryPipeline.ts — kept only registerAllCommands (DB registration + content hashing); removed summariseAllTasks, processPendingBatch, and all Copilot-touching helpers
• src/summaryOrchestration.ts — kept only registerDiscoveredCommands and a no-Copilot syncAndSummarise; removed runSummarisation, initAiSummaries, aiSummariesEnabled, and the file-watcher Copilot trigger
• src/extension.ts — removed the commandtree.generateSummaries and commandtree.selectModel command registrations and the activation-time AI startup
• package.json — removed the commandtree.enableAiSummaries and commandtree.aiModel settings and the two AI commands; no setting remains for a user to flip back on by accident

Damage prevention (vs #20): grep confirms zero remaining references to vscode.lm, LanguageModelChat, selectChatModels, enableAiSummaries, aiModel, generateSummaries, selectModel, summariseAllTasks, or forceSelectModel anywhere in src/ or package.json. The bomb is fully disarmed: there is no command, no setting, and no code path that can reach Copilot.

Docs (VSIX-bundled only — website intentionally untouched):

• README.md — dropped the "AI-powered" tagline, replaced the "AI Summaries (powered by GitHub Copilot)" section with a "temporarily removed" notice linking Extension consumed hundreds of Copilot requests in minutes without clear warning or model selection #20, removed the AI feature bullet and the enableAiSummaries settings row
• CHANGELOG.md — added a 0.11.0 "Removed" entry explaining the reason and the conditions for return
• Claude.md — updated the project overview to drop "AI-generated summaries"

Other:

• coverage-thresholds.json — auto-bumped by tools/check-coverage.mjs to reflect the post-deletion measured coverage
• summaryTooltip.e2e.test.ts — only a header comment edit; the test still proves the tooltip rendering path works against summaries seeded directly into the DB

Net diff: +36 / −1143 across 14 files.

How Do The Automated Tests Prove It Works?

make ci (fmt + lint + test + build + package) all pass locally:

• Unit suite — 105 passing. Includes discovery.unit.test.ts, taskRunner.unit.test.ts, taskItem.unit.test.ts, treehierarchy.unit.test.ts, markdownDescription.unit.test.ts, dbLockRecovery.unit.test.ts. The previously-deleted modelSelection.unit.test.ts is gone because the code it tested is gone.
• E2E suite — 356 passing in 3m. Covers activation (zzActivationNonBlocking.e2e.test.ts), command registration (commands.e2e.test.ts — asserts every contributed command exists and there are no orphans), discovery across all 22 task types (discovery.e2e.test.ts, coverage.e2e.test.ts), execution (execution.e2e.test.ts, runner.e2e.test.ts, dockerExecution.e2e.test.ts), tag/filter/quick-launch flows, and the rendering path that was previously fed by AI (summaryTooltip.e2e.test.ts — seeds a summary directly via upsertSummary and asserts the tooltip + warning glyph render correctly).
• Configuration test (configuration.e2e.test.ts) reads the live package.json contributions and passes against the trimmed settings, proving the manifest is internally consistent.
• Coverage gate — tools/check-coverage.mjs accepts: lines 92.94%, functions 94.65%, branches 88.04%, statements 92.94%; thresholds in coverage-thresholds.json updated accordingly.
• Build — tsc -p ./ produces no errors with the dead AI files removed (would fail loudly if any surviving file still imported ./semantic/summariser or ./semantic/modelSelection).
• Package — make package produces commandtree-0.11.0.vsix (1.36 MB, 65 files); semantic/ is now 3 files (down from 5), confirming the deleted modules don't ship.

Closes #20.