feat(skills): add setup-projects-meta + using-projects-meta pair

Wraps the local projects-meta-mcp stdio server with the validated split-pair
pattern (setup-X / using-X), 4th application after context7 / wiki / tasks.

setup-projects-meta — 8-phase install: clones server repo to
~/.local/projects-meta-mcp, builds, writes ~/.config/projects-mcp/auth.toml,
clones shared wiki to ~/projects/projects-wiki/ (canon path; legacy
~/projects/.wiki is detected and migrated — old path caused the
wiki-path-mismatch bug, fixed upstream in 621a69f), registers
mcpServers.projects-meta in ~/.claude.json. Confirmation gates between
discovery and writes.

using-projects-meta — runtime policy: read tools (tasks_aggregate,
knowledge_search, meta_status, ...) and mutation tools with mandatory
two-step preview→confirm. Carries the local-first rule inline: for the
current project read .tasks/ / .wiki/ from disk; MCP cache is for *other*
projects only.

Wiki concept page concepts/projects-meta-skills.md documents the design,
the path-canon fix, and the round-trip task lifecycle across machines.

Closes [projects-meta-skills] in claude-skills (created from
DESKTOP-NSEF0UK via projects-meta-mcp).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.wiki/log.md

@@ -28,5 +28,7 @@ Parseable: `grep "^## \[" .wiki/log.md | tail -20`.
 ## [2026-04-28] refactor | this repo's `.tasks/` migrated to canonical layout — flat `## Done`/`## Backlog` replaced by emoji-status board (7 ⚪ Ready blocks); historical Done entries dropped (preserved in git log); `.bak` ignored via .gitignore
 ## [2026-04-28] cleanup | removed stale `~/.claude/skills/{wiki-maintainer,task-status-wiki}/` installs (replaced by `using-wiki`/`using-tasks`); 16 skills installed, no duplicates; context7 plugin (mcp__plugin_context7_context7__*) confirmed live after restart
 ## [2026-04-28] decision | install-portability — `install.sh`/`build.sh` patched to drop `mapfile`+`find -printf`; stock macOS (bash 3.2 + BSD find) now works; verified on git-bash (16 skills discovered, sorted, installed; build.sh produces archive)
+## [2026-04-29] decision | projects-meta-skills — built `setup-projects-meta` (8-phase install of projects-meta-mcp + auth.toml + MCP registration) and `using-projects-meta` (runtime policy with local-first rule and two-step mutation); skill pair pattern applied for the 4th time (context7 / wiki / tasks / projects-meta); both built + installed; visible to the harness
+## [2026-04-30] refactor | projects-meta-skills — wiki path canon corrected: `~/projects/.wiki` → `~/projects/projects-wiki/` (clone root), content at `~/projects/projects-wiki/.wiki/`. Old path caused write/read mismatch bug (fixed upstream in commit `621a69f` of `projects-meta-mcp`). Setup-projects-meta Phase 1 now detects legacy clone, Phase 4 re-clones to canon. Lesson: pull shared resources before relying on cached anchors
 ## [2026-04-28] decision | project-bootstrap@1.1.0 — added Step 5.6: detects `superpowers@claude-plugins-official` via `~/.claude/plugins/installed_plugins.json` and prints install command + upstream link if missing; chat-only, never auto-installs (slash commands aren't callable from a skill, and silent plugin install is overreach)
 ## [2026-04-28] doc | README.md + README.ru.md — new "Using skills in projects" / "Использование в проектах" section after install quick-start; describes project-bootstrap workflow (git, .gitignore, README, .wiki/, .tasks/, CLAUDE.md, manifest, superpowers-plugin check) and the init/upgrade modes