feat(register): a decided title, and an org-profile that stops lying

Three changes at the register/engine boundary, all agreed with org-ops
after census 05 and all about a check missing a place to record a
legitimate exception.

`titles`: an optional per-repo README title. Set, the H1 matches it and
is OK; unset, the WARN stands as before. A human title was already this
engine's stated position and rds-v1's prescription, but a decided YES had
nowhere to live, so the same 6 WARNs were reported three censuses running
and would have been reported forever. Five registered, each H1 read from
the repo rather than copied from the census; `ai-psychosis` deliberately
left out so the one repo where a reader cannot connect title to name
stands alone. Measured across 21 local clones: 6 WARN before, 1 after,
nothing else moved.

`readme_desc_match: false` on the org-profile class: for an ordinary repo
the README opening and the forge description describe the same subject
and equality is right; for this class they do not — the README is the
org's landing page, the forge text describes the repo. The equality is
what does not apply, not either text. Class data, not a hardcoded name,
and the exemption is RECORDED as an OK naming its reason, not dropped.
`.profile` went ERROR to 0 ERROR / 0 WARN; the same README under a plugin
class is still an ERROR.

`engineCommit`: the version names a file, only the sha names the code. A
sweep stamped 18 files 0.4.0 while four carried a 0.5.0-only finding —
feature and version bump are two commits, so the stamp lied without being
broken. Present-and-null when underivable, never absent: an absent key
means an older engine, null means this one ran without a HEAD to read.

135 to 147 tests.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NELsvPY5gnJjN3esdhWYWC

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "repo-standard",
-  "version": "0.5.0",
+  "version": "0.6.0",
   "description": "Per-repo gate for the open/ presentation standard: README first screen, install block, files required by the repo's class, and dead repo references.",
   "author": {
     "name": "Kjell Tore Guttormsen"