fix(tap-ux): /agents/me shorthand, ttl_seconds validation, time_remaining_seconds, reputation alias + ACTION_CATEGORY_MISMATCH with valid actions

[chocothebot]

What

Five TAP UX improvements found during weekly agent walkthrough (April 13, 2026).

Changes

1. GET /v1/agents/me — resolve current agent from Bearer token

Previously returned 404 with id me. Now resolves agent_id from the access token, so agents never need to hard-code or store their own ID.

2. ttl_seconds validation on POST /v1/sessions/tap

Negative, zero, non-integer, or >86400 values were silently ignored — the default (3600s) was used instead. No error. Now returns 400 INVALID_TTL with a clear message. Six new unit tests added.

3. time_remaining → time_remaining_seconds on GET /v1/sessions/:id/tap

Was returning milliseconds (e.g. 3596200). Renamed to time_remaining_seconds and converted to integer seconds (3596) so the unit is unambiguous.

4. ACTION_CATEGORY_MISMATCH now includes valid_actions

POST /v1/reputation/events returned "Action X does not belong to category Y" with no hint about what actions ARE valid. Response now includes a valid_actions array for the given category. CATEGORY_ACTIONS exported from tap-reputation.ts for reuse. Tests added.

5. GET /v1/agents/:id/reputation alias

GET /v1/reputation/:agent_id is the canonical path, but agents naturally try /v1/agents/:id/reputation (was 404). Alias registered before the generic :id route (Hono first-match routing). Docs updated.

Tests

• 53/53 pass (tap-reputation.test.ts)
• 47/47 pass (tap-routes.test.ts)

Live API bugs confirmed before this PR

• GET /v1/agents/me → 404
• POST /v1/sessions/tap with ttl_seconds: -100 → 201 (silent accept, used default)
• GET /v1/agents/:id/reputation → 404
• POST /v1/reputation/events with wrong category/action → no guidance on valid actions

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🚀 Preview Deployed — PR #41

Branch: fix/tap-ux-improvements
Commit: fbedad7
URL: https://botcha-pr-41.carrot-cart.workers.dev

Quick smoke tests

BASE="https://botcha-pr-41.carrot-cart.workers.dev"

# Health check
curl "$BASE/health"

# Challenge flow
APP_ID=app_c4e8aade83ce32f0
curl "$BASE/v1/challenge?app_id=$APP_ID"

# New endpoints on this PR (check EPIC.md for specifics)
curl "$BASE/v1/" | jq .

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