feat: CEO review handoff context for /office-hours chaining (v0.9.5.0) (#288)

* feat: CEO review saves handoff context for /office-hours chaining

When /plan-ceo-review suggests running /office-hours, it now saves a
handoff note with system audit findings and discussion context. On
re-invocation, the note is auto-discovered and used to avoid redundant
questions. Addresses Codex review feedback: no step tracking or resume
logic — just context as additional input (same pattern as design docs).

* fix: remove PR size nagging from /retro codex variant

Sync the Codex SKILL.md variant with the retro template changes from
v0.9.4.1 — removes "flag these with file counts" for XL PRs and
reframes PR size discussion as neutral data.

* chore: bump version and changelog (v0.9.5.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

VERSION

@@ -1 +1 @@
-0.9.4.1
+0.9.5.0