Convert agent boundary modules to TypeScript

[graphanov]

Summary

• Converts the Phase 2 agent boundary modules from checked JavaScript to TypeScript while preserving the existing runtime behavior and NodeNext .js import specifiers.

Scope

• Renames provider/router/runtime/tools plus tool-errors/adaptive-router to .ts; replaces JSDoc typedefs with shared contracts and module-private wire types; updates boundary tests to import the compiled dist output; refreshes current TypeScript migration docs.

Out of scope

• No version bump, merge, release, publish, workflow dispatch, build-pipeline change, or conversion of context/deadline/thinking, CLI, hooks, config, MCP, plugin, REPL, or test files.

Verification

• npm run build -> passed; npm run typecheck -> passed; npm run build && node --test test/*.test.mjs -> passed (429 tests); npm run test -> passed (429 tests); node bin/lazyglm.js --version -> lazyglm 0.1.4; NPM_CONFIG_CACHE= npm pack --dry-run -> passed; git diff --check -> passed.

Risk

• Moderate: provider streaming/SSE, runtime hook/tool execution, and tool-handler typing are boundary-sensitive. Mitigated by keeping behavior changes out of scope and running the full local test suite against dist.

Linked issue

Closes #50

Authority boundary

Draft PR only. No merge, release, publish, workflow dispatch, force-push, branch-protection, settings, or secret authority used.

[graphanov]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Keep it up!

Reviewed commit: 73f6bc71b4

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[graphanov]

Status: draft verified on latest head; ready for review.

Evidence:

• PR Convert agent boundary modules to TypeScript #58 head 73f6bc7: GitHub ci → SUCCESS; no unresolved review threads; forbidden paths unchanged. Local verification: git diff --check origin/main...HEAD → clean; npm run build → passed; node --test test/*.test.mjs → 429 pass / 0 fail; npm run typecheck → passed. Codex normal PR comment reviewed commit 73f6bc7 and reported no major issues.

Next: Marking the PR ready for review. No merge, publish, release, or duplicate Codex-review trigger is authorized or needed for this head.