Seal Sprint #004 and persist its graph snapshot

[GstMirabal]

What this changes

Session-close protocol (close_workflow.md). Documentation and state only; nothing in users/ changed.

Phase	Result
Topographic audit	No empty folders; all docs conform to Option B naming
Graph rebuild	3926 nodes, 4554 edges, 463 communities
Freshness gate	Exit 0
Entry-point anchors	Stamped to the current tip
Memory purge	5 telemetry entries, after the survivors were written
Submodule purity	Clean, and pinned to the commit the host declares

graph_stats.json was missing

The freshness gate's structural-delta check compares against a tracked snapshot, never graphify-out/, which is gitignored. Sprint #4 never wrote one, so the series ran 000→003 and stopped:

  sprint 000: nodes=3003   sprint 003: nodes=3501
  sprint 004: nodes=3926   ← added here

A first attempt used an integer sprint_id and omitted built_at_commit and captured_date. Checked against the schema of the four before it and corrected.

Anchors were two days stale

0_SYSTEM_OVERVIEW.md and GLOBAL_ROADMAP.md carried SHAs from before the last three merges. Stamped explicitly rather than by inference — the workflow names this step precisely because a prior host let these anchors go stale for 34 sprints.

Memory

Three heuristics were written to persistent memory before the ephemeral purge, which is the order the Heuristic Pulse Gate exists to make deliberate:

• A test harness that is too helpful conceals the requirements it exists to expose.
• After a refactor, verify paths against every prefix the repository has ever used — and over every file type, not just the text ones you expect.
• Verify dependencies by installing into a clean environment; the manifest declares, the install resolves, and alerts lag both.

Note on RA-12

The rule targets ai-sprint/[ID]. Sprint #4 was closed and merged two days ago; this session was P5 and P6 work, and all of it landed through reviewed pull requests. There is no live sprint branch, so this goes through chore/session-close-004 — nothing direct to main, which is what the rule protects.

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