feat(using-system-snapshot): new skill v0.1.0

Thin read-only skill wrapping the single meta_system_snapshot MCP call
(poller status + local docker + cached cross-project task summary).
Replaces the scatter of tasklist / docker ps / manual meta_status.

Core rule: no claim about poller / local-docker / task-load state
without calling the tool in the current turn. Output = three lines,
one per section (docker lists only problem containers; tasks gives
Sigma active/blocked + busiest 2-3 projects). Liveness split documented
(poller+docker live, tasks from cache). Scope boundaries: deep single-
container diagnosis -> using-vds-ops / docker logs; precise per-task work
-> using-projects-meta. Read-only, no per-session grant.

Output shape verified by a live snapshot call 2026-06-09.
Wiki: concepts/using-system-snapshot-design.md + index + log.
TDD N/A (markdown policy artifact); behavioral smoke-test = paired
skill-using-system-snapshot-review task.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.wiki/index.md

@@ -43,6 +43,7 @@ Catalog of all wiki pages. One line per page, organized by type. Updated on ever
 - [session-handoff-skill-design.md](concepts/session-handoff-skill-design.md) — design rationale for the `session-handoff` skill (sliding overwrite into `.tasks/NEXT_SESSION.md`, phrase whitelist + substantive-commit heuristic, optional PostToolUse hook for harness-side determinism, orient+ask default, project scope, cluster 7/7 closure)
 - [using-tasks-session-break.md](concepts/using-tasks-session-break.md) — `using-tasks` v1.2.0 `session_break` marker: task-author-set boolean/string flag; after a task closes 🟢, before `tasks_claim_next`, an autonomous agent prints the verbatim SESSION BOUNDARY line and stops instead of chaining the next task. Absent → unchanged
 - [delegate-task-session-break.md](concepts/delegate-task-session-break.md) — `delegate-task` v0.2.2 — authoring side of the `session_break` marker (consumer = [[using-tasks-session-break]]): pre-flight Q6 + optional template field `session_break: true | "<hint>"`; three set-it cases (domain-switch / milestone / heavy infra); not a default
+- [using-system-snapshot-design.md](concepts/using-system-snapshot-design.md) — `using-system-snapshot` v0.1.0 — thin read-only skill wrapping the single `mcp__projects-meta__meta_system_snapshot` call (poller + local docker + cached task summary); replaces scattered `tasklist`/`docker ps`/manual `meta_status`; core rule = no liveness claim without calling the tool this turn; three-line output; defers deep docker to [[using-vds-ops]] and precise tasks to [[using-projects-meta]]
 - [delegate-task-negative-trigger-fp.md](concepts/delegate-task-negative-trigger-fp.md) — `delegate-task` v0.2.1 FP fix: «создать задачу себе» stem-matched the «создать задачу на агента» positive trigger; abstract "does NOT apply when doing the work yourself" carve-out loses to literal stem-match under the 1%-rule → made the negative literal + routed (→ using-tasks). Verified pos 5/5, neg 4/5 (was 0/5)
 
 ## Packages