feat(creative-ideas): wire the Creative Ideas thread into the running daemon (#2647)

[rysweet]

Why

The Creative Ideas subsystem merged in #2647 but was never activated. The
OODA daemon never called creative_ideas::register(...), so at runtime there
was zero creative-ideas activity — the operator saw it "not working". This
PR wires the generator thread into the running daemon so it operates on its
configured cadence.

What (additive)

• Daemon wiring (src/operator_commands_ooda/daemon/mod.rs): the
  cognitive-thread Mind runtime is now built when either
  SIMARD_COGNITIVE_THREADS_ENABLED (maintenance/engineer-log, default-OFF)
  or the Creative Ideas gate is on. The thread is registered through a new
  register_creative_ideas_if_enabled(&mut mind, &cfg) seam, independent of
  the generic master switch — mirroring the default-ON Overseer/Journal threads.
• Enablement (src/creative_ideas/mod.rs): CreativeIdeasConfig is now
  default-ON, opt-out. from_lookup leaves the subsystem ON for
  unset/empty/truthy values; only an explicit falsey value (0/false/no/off)
  opts out via SIMARD_CREATIVE_IDEAS_ENABLED.
• Full pipeline reachable: the wired tick drives
  generation → ProspectiveMemory ideas → reviewers (crusty-old-engineer,
  philosophy-guardian, measurability) + synthesis → routing
  (accepted → goal; needs-human → labeled, @rysweet-tagged issue;
  idea PRs carry the creative-idea-needs-human-review blocking label, enforced
  by standard GitHub mechanisms — never --admin/--no-verify).
• Observability: a dedicated startup log line
  (creative-ideas thread ENABLED (default) (interval = 86400s; …)) plus the
  existing per-tick cognitive-thread summary (generated/persisted/reviewed/routed
  counts), which also flows into the Overseer activity feed and dashboard/journal.
• systemd (scripts/simard-ooda.service): documents the default-ON opt-out
  and the least-privilege gh/token scope the routing step needs.
• Docs + stale comments: refresh the design/howto/reference docs and the
  now-inaccurate "not wired / gated OFF" comments in lib.rs,
  cognitive_threads/threads/mod.rs, and cognitive_memory/creative_idea.rs.

Tests (hermetic, no network)

• register_if_enabled_registers_when_default_on / _registers_when_env_unset
  — the daemon seam registers the thread at startup.
• register_if_enabled_skips_when_opted_out / _skips_when_disabled_via_env
  — disabled via env ⇒ not registered.
• wired_thread_tick_generates_reviews_and_routes — an enabled tick generates
  ideas into ProspectiveMemory and runs the review + routing pipeline
  (goal path).
• wired_pipeline_human_review_files_issue_with_label_and_owner — needs-human
  routing files a labeled, owner-tagged issue.
• Plus dry-run, tick-is-total-on-error, and default-ON opt-out config tests.

Deployment note

After merge + redeploy, the operator will see the startup ENABLED line and, on
each due tick, creative ideas being generated + reviewed + routed.

Refs #2647

[github-actions]

📊 Coverage Summary

Generated by cargo llvm-cov --workspace --summary-only (nightly, excluding test files)

Module	Lines	Covered	Coverage
Total	146074	121705	83.3%

_{Coverage data from CI run. Test files matching tests?/ are excluded from line counts.}