refactor(agents): conductor/faculty tiers + rename health→vitals, doctor→health - #11

Make the two-tier structure explicit in the filesystem: front-door agents a
human drives (decide AND act) live under agents/conductors/; read-only
reasoning capabilities the conductors consult (only opine, never dispatch or
mutate) live under agents/faculties/.

- Move feature/build/release -> agents/conductors/; health -> agents/faculties/
  (git-tracked renames, history preserved).
- Repoint sourcing (../_common.sh -> ../../_common.sh) and the
  consult_health_agent_verdict path to faculties/health/.
- Dispatcher (bin/pyauto-brain): tier-grouped help menu, tier-aware doc lookup,
  and the new doctor conductor registered.
- Add each spec a "Tier:" declaration line; describe the two tiers in the
  top-level AGENTS.md and README.

Add the doctor conductor (skeleton): the organism's clinician that runs the
health loop with a human — assess -> triage -> (on go-ahead) dispatch a
validation leg -> re-judge — until Heart goes green. It consults the health
faculty for every verdict and delegates all dispatch to the release conductor;
scope is validation + recommend, checkpointing every dispatch. Edit-in fixes
are a deliberate follow-up.

Verified: help menu, cross-tier doc lookup, bash -n on all moved scripts, the
pyauto-agent shim, and a full `pyauto-brain doctor` run exercising the moved
consult chain (doctor -> _common -> faculties/health -> Heart).

Co-Authored-By: Claude <noreply@anthropic.com>

…alth

Sharpen the two-tier naming so it reads as an intrinsic organ, not an
external visitor:

- Faculty  health -> vitals  (agents/faculties/vitals/): the read-only
  "reads the Heart's pulse" judge. `vitals` reads as a read-only measurement,
  matching the faculty's opine-only role, and steps on nothing (unlike `pulse`,
  which is PyAutoHeart's own deprecated-but-live alias).
- Conductor doctor -> health (agents/conductors/health/): the organism's
  clinician is named for what it manages (the organism's health), not an
  outside doctor.

Mechanics:
- git-tracked renames of both dirs + their entry scripts (vitals.sh, health.sh).
- consult_health_agent_verdict -> consult_vitals_verdict in _common.sh (path
  now faculties/vitals/vitals.sh), with a back-compat alias kept.
- Dispatcher: menu + registry updated; `pyauto-brain vitals` (faculty read),
  `pyauto-brain health` (conductor loop).
- Repoint every "Health Agent" (the judge) -> "vitals faculty" across specs,
  scripts, and skills, and every subcommand-forwarding `pyauto-brain health`
  -> `pyauto-brain vitals` (the conductor only accepts `assess`; forwarding a
  Heart subcommand must go through the faculty).
- Pulse metaphor preserved as prose in the vitals description, not as an
  identifier.

Verified: help menu + tiered doc lookup, bash -n / ast parse on all scripts,
the back-compat alias, `pyauto-brain vitals` (card) and `pyauto-brain health`
(assess -> consult vitals -> YELLOW -> recommend) end-to-end, and
`build --dry-run` consulting the vitals faculty.

Co-Authored-By: Claude <noreply@anthropic.com>

Front-load the temporal clause so it no longer reads as the awkward
"reason on a routine run". Same nit Copilot raised on the operating-agreement
text in PR #10; fixed here too since the section lives in the vitals spec.

Co-Authored-By: Claude <noreply@anthropic.com>

…re-review)

- `readiness.yellow_reasons` implied a nested JSON shape; the readiness output
  has `yellow_reasons` at the top level. Reworded to "the readiness output's
  top-level `yellow_reasons`".
- The `pyauto-heart fix <ci|dirty|drift|timing>` shorthand read as literal
  syntax and was inconsistent with the Procedure section's explicit forms; now
  `pyauto-heart fix <topic>` with the topics listed as examples.

Co-Authored-By: Claude <noreply@anthropic.com>