feat(update-claude-skills): add update skill + scripts [v0.1.0]

New skill and cross-platform scripts that automate the full uplift cycle:
git pull → conditionally rebuild MCP servers → install skills → version
diff → reload hints. Claude-Code-only (Hermes uses hermes-installer-skill).

- scripts/update.sh: bash version (Linux/macOS/git-bash)
- scripts/update.ps1: PowerShell version (Windows)
- skills/update-claude-skills/SKILL.md: thin wrapper, detects platform
- hermes/mapping.yaml: mode: skip (Claude-Code-only)
- dist/update-claude-skills.skill: built archive
- .tasks/STATUS.md: task marked done

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

skills/update-claude-skills/SKILL.md

@@ -0,0 +1,84 @@
+---
+name: update-claude-skills
+version: 0.1.0
+description: >
+  Full uplift cycle for an existing claude-skills installation: git pull,
+  conditionally rebuild MCP servers, install skills, show version diff, suggest
+  reload. Trigger on "update claude-skills", "sync claude-skills",
+  "обнови claude-skills", "обнови всё", or when the user wants to bring their
+  skills up to date. Cross-platform (PowerShell on Windows, bash on Linux/macOS).
+  Does NOT handle greenfield bootstrap — that's project-bootstrap's job.
+---
+
+# update-claude-skills
+
+> One command to bring your claude-skills installation fully up to date — repo, MCP servers, skills, and version diff.
+
+## When this runs
+
+**On explicit trigger** — when the user says any of: `update claude-skills`, `sync claude-skills`, `обнови claude-skills`, `обнови всё`, `update skills`, or close variants asking to refresh the skills catalog.
+
+**Never** automatically at session start (that's `pulling-before-work`'s job for the git part). This skill is for the full uplift cycle — git + build + install + diff — which is heavier and intentional.
+
+## Process
+
+### 1. Detect platform
+
+Determine which script to run:
+
+- **Windows (PowerShell):** `pwsh ~/projects/claude-skills/scripts/update.ps1`
+- **Linux / macOS:** `bash ~/projects/claude-skills/scripts/update.sh`
+
+Use the `active-platform` skill's detection if available. Otherwise:
+- If `$env:OS` is `Windows_NT` or `IsWindows` is true → PowerShell path.
+- Otherwise → bash path.
+
+If the repo is at a non-default location, adjust the path accordingly (the user may have cloned to `~/projects/claude-skills` or another directory — check `git -C <path> rev-parse --is-inside-work-tree` if unsure).
+
+### 2. Run the update script
+
+Execute the appropriate script. Show the output to the user — it contains version diffs and reload hints.
+
+If the script exits non-zero, **stop** and show the error. Common failures:
+- `git pull --ff-only` fails → the repo has diverged or there's no upstream. The user must resolve manually.
+- MCP build fails → show the error, suggest running `npm run build` / `pip install -e .` manually.
+
+### 3. Offer to reload MCP servers
+
+If the script output mentions "MCP servers rebuilt" or "source changed":
+
+> MCP servers were rebuilt. Run `/reload-mcp` to reload them.
+
+If no MCP changes:
+
+> Skills updated. Start a new session (or `/clear`) for changes to take full effect.
+
+### 4. Offer to run new setup skills
+
+If the script detected new `setup-*` skills that aren't yet installed:
+
+> New setup skills available: `<list>`. Want me to run any of them?
+
+The user decides — never auto-run setup skills.
+
+## What the scripts do
+
+The update scripts (`scripts/update.sh` and `scripts/update.ps1`) handle:
+
+1. **git pull --ff-only** in `~/projects/claude-skills/` (stash if dirty, pop after).
+2. **Conditionally rebuild projects-meta-mcp** — if `~/projects/.common/lib/projects-meta-mcp/` has a `.git` directory and source changed (`git pull` fetched new commits), run `npm run build`.
+3. **Conditionally rebuild interns-mcp** — same pattern, `pip install -e .`.
+4. **Install all skills** via `install.sh` / `install.ps1`.
+5. **Show version diff** — before/after `version:` frontmatter for each skill.
+6. **Print reload hints** — `/reload-mcp` if MCP changed, new session otherwise.
+
+## Out of scope
+
+- **Greenfield bootstrap** — use `project-bootstrap` for first-time setup on a new machine.
+- **`--prune` flag** — removing skills not in `skills/` from `~/.claude/skills/`. Tracked separately in `[install-ps1]`.
+- **Hermes-side update** — `hermes-installer-skill` handles the Hermes/Linux factory path.
+- **Auto-run setup skills** — the user decides which new setup skills to configure.
+
+## Cross-agent applicability
+
+Pure orchestration — calls platform scripts, no Claude-specific tool references. Hermes-mappable as `mode: skip` (Claude-Code-only; Hermes uses `hermes-installer-skill` instead).