* docs(#3467): adr-3408 state.md write-path behavior contract
* docs(#3467): correct write-seam caller list and adr heading depth
Review findings from the Standards and Spec axes, fixed in place:
- ADR behavior contract demoted from H2 to `### 8` with `#### 8.x`
subsections, matching ADR-3180's `### 7` / `#### 7.1` precedent the
front matter claims to follow.
- CONTEXT.md placed the STATE.md factory-reset primitive at
verify.cts:1925. It moved to health-diagnostic.cts:337 when
cmdValidateHealth migrated onto the rule table (#3309); verify.cts
now has no writeStateMd call. The design intent was correct — only
the address was stale.
- A repo-wide scan found three direct writeStateMd callers, not two:
cmdStateSync, cmdMilestoneComplete, and the REGENERATE_STATE remedy.
The last is documented as a sanctioned permanent exception — it is
a factory reset, so preservation would restore the values it was
invoked to discard.
- phase.cts comment citation corrected to :2953-2957.
- Amendment 4 attribution corrected: the recorded owner-file exemption
failure is roadmap-parser.cts; the state.cts transfer is this ADR's
own extrapolation.
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Co-authored-by: sim <sim@local>
