rill-project-html-digest: decision-material digest at /project read moments

[tarr1124]

Implements the third layer of the read-moment HTML generation model (ADR-082 Phase 2 / G5), after /focus (#86) and /close (#87): /project generates a decision-material HTML digest into projects/{slug}/.view/ at its two read moments — status mode (after the overview render) and run mode on stop (after the run summary).

Plan summary

• New section "Project Digest (read-moment HTML)" in skills/project/SKILL.md: one generator, two section weightings (run-end leads with stop reason + pending decisions + next actions; status leads with current position + next actions)
• Ordering: derived views first — /refresh-project current at the read moment (re-run at a run stop), then /refresh-decisions synchronously, then read the refreshed MD sources; on refresh failure/timeout, skip generation (a snapshot must not freeze stale material)
• Pending decisions re-express the contract-v1.1 fields (Decision / Background / Choices / Default / Blocks / More, ADR-084); consequence-framed and zero-context readable (D82-8 / D84-7) — no internal labels on the page
• Dated snapshots digest-{YYYY-MM-DD}.html (-2, -3 same-day), claimed by exclusive creation, never overwritten; self-contained; provenance comment; non-fatal with partial-file cleanup; user skip line
• run mode Step 3 persists the run summary as a project artifact (NNN-run-summary-{date}.md) so the run-end digest stays a pure derived view (rill-html-output.md principle 4), covered by the final rill push

Codex review

• Round 1: 1 [P2] (stale /refresh-project at run stop) — fixed: fresh recompute required at the stop moment
• Round 2: 2 [P2] (no refresh-success guard before an immutable snapshot; concurrent same-name snapshot writes) — fixed: skip-on-stale-refresh + exclusive-creation naming
• Round 3: 0 P-findings

PUBLIC guards: CJK guard pass; non-ASCII in diff limited to § and — (both pre-existing in this file); no PII / email / phone.

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