[clubanderson]

Closes #12368 — RFC #12062, proposal B (API + dashboard), panel 4 — Boundary enforcement (the N behind "nothing bad happened").

What

• New evPanel card Boundary enforcement in the Throughput section's Evidence sub-panel, between panels 3 and 8. Same ev-panel chrome, inline SVG, no new deps, no inline style=.
• Attempted vs blocked bars per intent tier (0 ADVISORY … 3 ISSUES_PRS_MERGE, unknown tier keys after), scaled against the busiest tier, blocked % on the row, and the top 3 blocked_by_reason codes in the row <title> tooltip.
• Sentinel hits per ISO week sparkline from sentinel_hits_per_week, first/last week labels and total / peak in the legend.
• n= is total attempted writes across tiers.
• "What this does not show" note: counters are proxy-side observations (all-time totals from the durable file; reset semantics follow the weekly file; they do not follow the Throughput window), direct writes that bypass the proxy are invisible, and intent-verification would-block counts are not part of these bars (kept generic so it stays accurate whether or not ✨ intent: per-tier evaluated / would-block counters in the audit log + durable counter file #12362 has landed).
• Graceful empty state when write_counters is omitted (counter file absent) and when no sentinel weeks exist.
• API: EvidenceWriteCount in GET /api/evidence/summary now passes through blocked_by_reason (omitempty) from the counter file so the tooltip has data; api-reference.md and review-evidence.md updated. Changelog fragment added.
• Tests: evidence_card_ui_test.go pins the helpers, panel key, tier list, reason handling, empty states, note text, CSS and panel order; evWriteCountersSvg / evSentinelSparkline added to the ReferenceError guard; TestLoadEvidenceWriteCounters checks blocked_by_reason.

Guardrail (RFC #12062 Non-goals)

Record/read-path only. Nothing in this PR reads into or alters merge eligibility or auto-merge; the proxy counters are read from the file, never written, and tests touch only the summary loader and index.html markup.

cc @mrbobbytables

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Update (rebase onto v5 after #12416):

• Rebased onto origin/v5; panel order is now 1 · 2 · 3 · 4 · 5 · 8.
• Added the EV_EXPLAINERS['boundary-enforcement'] ⓘ explainer (Why it matters · What is measured · How it is measured · What good looks like · What ours shows). Graded on proxy-blocked ÷ attempted agent writes via new named constants EV_BLOCKED_STRONG = 0.05 / EV_BLOCKED_FAIR = 0.15; row added to the grade table in review-evidence.md.
• Window behaviour: sentinel_hits_per_week is built from the bundles selected by the 24h/7d/30d/custom window (hours/from/to) so it follows the selector. write_counters come from the proxy's durable counter file which only stores all-time totals (no per-time data), so they cannot follow the window — this is disclosed in the panel note and the explainer rather than hidden.
• SVG helpers size from EV_SVG_W; fixed a v5 test comparison (EvidenceWriteCount is no longer comparable once blocked_by_reason is a map).

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[github-actions]

Open PR overlap check

Base branch: v5

Conflicts are checked with every PR merged onto the current tip of v5, so a PR that only needs a rebase is not reported as conflicting with its siblings.

PR	Title	Relation	Files
#12434	✨ labels: stage/N state-machine labels for issues and PRs	same files	src/pkg/dashboard/static/index.html
#12421	✨ nous: deliver opt-in Hive-self feature flags over heartbeat	same files	src/docs/api-reference.md
#12415	✨ feat(dashboard): add evidence maintainability trend panel	CONFLICT	src/pkg/dashboard/static/index.html
#12428	✨ evidence: emit revert rates by author kind for the hub drill-down	same files	src/docs/review-evidence.md
#12332	✨ feature: Add cadence templates for quickly setting cadence for all agents (#12300)	same files	src/pkg/dashboard/static/index.html

[hivecommons-hive]

hive: this PR now conflicts with v5 (mergeable_state=dirty) in: src/docs/api-reference.md, src/docs/review-evidence.md, src/pkg/dashboard/evidence_card_ui_test.go, src/pkg/dashboard/static/index.html (the evidence panels 5/#12386 and maintainability work landed on v5 in the same regions). Hive does not rewrite human-authored branches, so it is deferred until rebased; CI re-runs on push and the sweep merges when green.

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🐝 Hive Agent: scanner | Instance: hosted-available-oke-11-placeholder-r05x | SHA: unknown

— hive: agent=scanner backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

merged by Hive trusted-author auto-merge: author @clubanderson holds role owner and GitHub permission admin on repo; CI green at 4d6a517.

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