P2D: pivot skills to prompt-driven, drop value-add scripts (wj-o87)

[gpxl]

Summary

• Parity-first pivot: removes three bash scripts (inventory.sh,
  inject-pointer.sh, diff-summary.sh) that had no OpenWiki counterpart —
  wijzer's doctrine is to never carry scripted behavior OpenWiki itself
  doesn't have. Their tests are removed alongside them.
• Prompt-driven skills: skills/init/SKILL.md and skills/update/SKILL.md
  are rewritten as thin wrappers. Discovery, git inspection, and the
  AGENTS.md/CLAUDE.md pointer block are now prompt-driven (following the
  generated disciplines) instead of scripted, calling only the
  exact-semantics scripts (check-noop, snapshot, write-state,
  check-format). update scopes its git inspection from
  openwiki/.last-update.json using OpenWiki's
  gitHead -> updatedAt -> recent-history fallback chain. skills/ask is
  unchanged.
• Generator reversal: scripts/build-disciplines.mjs now derives
  OpenWiki's verbatim ## OpenWiki pointer block instead of substituting a
  scripted alternative — this deliberately reverses P2C's
  inject-pointer.sh adaptation. Fenced code blocks are exempted from
  vocabulary translation and the residual-vocab guard via a new
  withFencesProtected helper (with an even-fence-count assertion), so the
  literal block survives generation unmodified. references/disciplines.md
  and references/wiki-format.md are regenerated from the reversed
  generator.
• Docs updated to match: PARITY.md, references/state-schema.md,
  README.md, CLAUDE.md, CHANGELOG.md (new P2D entry), plus a stale
  tests/noop.test.ts reference fix. agents/wiki-scout.md aligned to the
  subagent discipline.
• Tests: tests/plugin-structure.test.ts gains P2D structural guards;
  tests/build-disciplines.test.ts gains verbatim-block + fence-strip
  assertions.

Both independent quality reviews passed: the code-quality agent
(82 tests green, shellcheck clean, no coverage/quality gaps) and an
independent Fable-5 correctness/intent review, after two rounds that
fixed real blockers.

Bead: wj-o87 (P2D)

Merge policy

Squash + delete branch per this repo's pr_merge_strategy. Not merging
here — leaving that to the merge/CI step.

Test plan

• npm test — 82 tests passed (8 files)
• npm run lint — shellcheck clean
• Build — n/a (build_cmd: (none) for this repo)
• Code-quality agent: PASS
• Independent Fable-5 review: PASS (after fixes)
• Manual verification

🤖 Generated with Claude Code