Plan grok viz background execution

Current — the latest status report. Reports freeze once published; corrections appear in later reports.

Grok viz — background-subagent execution rule (amendment record)

Why this document exists. Commit 72be089 inserted the execution rule below into the frozen plan 2026-07-19-grok-compat-and-mermaid-viz.md after it was published — a violation of the frozen-plan invariant that the first manifest-driven wiki publish (2026-07-22) surfaced as source-hash drift and refused to publish. The frozen plan has been restored to its originally published content (ledger hash 0bfe624745fd, commit d900bd8); the rule is preserved here as the design record. Its operative home is plugin/commands/viz.md, which implements it.

Execution rule: always a background subagent

Viz work never blocks the main thread. Both the implementation waves and the recurring runtime step (regenerate diagrams + republish the roadmap after log changes) are delegated to ONE background subagent, run in parallel with other tasks — the same non-blocking pattern plan-capture uses for ticket/wiki publishing. The main session folds the result in when the notification arrives; it never waits.