v2.20.1 — .STATUS parsing fixes

lib.status reads the frontmatter .STATUS dialect and takes phase only from
a phase: key; /rforge:restore counts NEWS entries under ## subsections;
MediationVerse doctrine in the Command Guides. No command-surface change (44).

Added

• MediationVerse doctrine subsections in the Command Guides
  (docs/guides/cran-submission.md, dev-cycle.md, s7-review.md): the
  ecosystem-specific CRAN, S7 and testing guidance retired from savant's
  research-only skills, kept separate from the generic advice (#76).

Fixed

• lib.status now reads the key: value frontmatter .STATUS dialect every
  mediationverse R package uses, not only the emoji-section template. Before,
  none of the 7 packages parsed, and the progress figure was scraped from any
  N% in the prose, so every package reported a wrong number (mediationverse
  showed 100% while BLOCKED at 92%). Hybrid files parse from both halves; the
  prose-percentage fallback runs only when there is no progress: key (#75).
• lib.status no longer takes phase from the prose of a key: value
.STATUS. It used the first Phase X: anywhere in the file, which in that
  dialect is always an old history note (rforge's own .STATUS reported
  "4 orchestrator rewrite (last craft-parity item)"; medfit, medsim and
  missingmed were affected too). Frontmatter files now take phase only from a
  phase: key; the emoji dialect keeps the prose scan (#82).
• lib.rstatus.parse_news_header (used by /rforge:restore) reported 0 NEWS
  entries for R-convention NEWS files that group bullets under ##
  subsections (# pkg 0.4.0 → ## New features): the top section ended at
  the first header of any level. It now ends at the next header of the same
  or higher level, or at a deeper header naming a release (## [0.3.0]), so
  a # Changelog wrapper still scopes to nothing rather than the whole
  history (#78).

Internal

• AGENTS.md added as a copy of CLAUDE.md for agents that read AGENTS.md.
  scripts/version_sync.py stamps and gates its command-count heading (#77),
  and a new test-all.sh check requires its body to match CLAUDE.md (#80;
  45 checks).
• lib.rstatus docstring (and the generated docs/reference/rstatus.md) no
  longer claims lib.status cannot read key: value files, which #75 made
  false; it now says why rstatus keeps its own parser (#81).

Tests: test-all 45/45 · pytest 604 passed / 2 skipped · 44 commands

Full changelog: v2.20.0...v2.20.1