fix(hooks): remove --stdin routing split that bypassed handler registry

[m0Nst3r873]

Summary

• Remove --stdin flag from getDispatchCommand — restores v0.17.2 backward-compatible hook command format
• Remove --stdin routing fork in index.ts — all hook-dispatch calls now go through hookDispatchCli's unified handler registry
• Register local-agent HTTP report/sync (incl. workspace binding prompts) as a new handler in the registry
• Keep --stdin as a no-op option declaration for forward compat with hooks already written to disk

Root Cause

PR #152 introduced a --stdin flag that split hook-dispatch into two mutually exclusive paths:

• --stdin present → local-agent.ts hookDispatch() (only does HTTP report/sync)
• --stdin absent → hookDispatchCli() (full handler registry: pull, update, contribute-check, mr-hint, etc.)

Simultaneously, getDispatchCommand was changed to emit --stdin in all hook commands. This means after upgrade, every hook goes through the local-agent path and silently drops all existing handlers: updateHandler, contributeCheckHandler, mrHintHandler, pullHandler, dashboardReportHandler, trackHandler, todowriteHintHandler.

Additionally, downgrading to v0.17.2 after upgrade causes --stdin to be rejected as an unknown option → all hooks fail silently (swallowed by 2>/dev/null || true).

Fix

1. builtin-hooks.ts — getDispatchCommand no longer emits --stdin
2. index.ts — unified code path: always calls hookDispatchCli
3. hook-handlers.ts — new localAgentHandler registered on all 4 events
4. local-agent.ts — exports reportAndSyncFromHook adapter for the handler

Compatibility

Scenario	Before this fix	After this fix
Upgrade (new CLI, new hooks)	contribute-check/mr-hint/update all lost	All handlers fire correctly
Downgrade to v0.17.2	--stdin unknown option → silent failure	Hook format matches v0.17.2 exactly
Existing hooks with --stdin on disk	N/A	--stdin accepted as no-op, still works

Test plan

• npx tsc --noEmit — no new type errors
• npx vitest run — hooks-golden (4), hooks (40), hook-handlers (12), contribute-check (33), mr-hint (13) all pass
• npm run build — clean build
• Manual: teamai init --force, verify settings.json hooks do NOT contain --stdin
• Manual: teamai pull on a machine with old --stdin hooks, verify reconcile upgrades them cleanly

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