fix(status): green the agent validator, fix door freshness, unblock root pytest

[zkAurora]

What

Two items carried over from the session handoff, plus adjacent fixes found while doing them.

Validate Agents CI — was red

agents/default.character.json was the only character file without a top-level id (it uses entity), and scripts/validate_agents.js rejects that. Added "id": "default" — matches the filename and the agent_registry alias key. Inert at runtime: the loader only reads name / tools / system_prompt via .get().

Doors — swarm:door:* populate correctly

• Freshness tiebreak bug. The newest-assertion-wins comparison used (door["age_s"] or 10**9). A door asserted under half a second ago has age_s == 0, which or turns into 10**9, so the freshest assertion sorted as the oldest and a stale aliased assertion would win. Extracted door_age() and fixed both swarm_heartbeat.read_doors_async and apps/status's _observe.
• apps/runtime._redis_write_doors now calls the shared write_door_async instead of re-inlining build_door_payload + r.set (same 600s TTL) — per the repo's "shared code lives in packages/" rule.
• New packages/swarm-core/tests/test_doors.py (12 tests) — doors had no coverage. FakeRedis gains scan_iter to support it.

pytest from the repo root was broken

Run from the root, pytest took the root as rootdir and never read packages/swarm-core/pyproject.toml, so asyncio_mode was lost and every async test errored with "async def not natively supported" (50 failures). Added [tool.pytest.ini_options] to the root pyproject.toml. 122 pass from the root now.

Note on history

This branch also rewrites the message of one earlier commit (chore(security): untrack the handoff log…) that spelled out internal infrastructure detail in prose. The tree is byte-identical; only the message changed. That commit is currently on main as 45c065b — see review thread; a normal merge will not remove it from main's history.

Verification

Check	Result
node scripts/validate_agents.js	all 37 files OK
pytest (repo root)	122 passed
each test file in isolation	pass
CI import-every-module / apps-compile / layout-invariants	pass locally

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