feat(adr-115): flip Status → Accepted (MQTT track) + property-based fuzz tests + ADR index entry

## Status flip — ADR-115 §Status

Per maintainer ACK (#776 issue body + 13 ACK'd open questions) and the
shipped implementation in PR #778 (410 lib tests, witness bundle
VERIFIED), the MQTT track is now Accepted. The Matter SDK wiring P8b
remains Proposed pending the §9.10 deferral to v0.7.1.

ADR header table updated:
- Status: "**Accepted** (MQTT track P1-P7 + P8a + P9 + P10 shipped
   2026-05-23 in PR #778, 410 lib tests, witness bundle VERIFIED) /
   **Proposed** (Matter SDK wiring P8b deferred to v0.7.1 per §9.10)"
- Codename: HA-DISCO (MQTT) + HA-FABRIC (Matter) + **HA-MIND** (semantic
   primitives) — the third codename always belonged in the masthead.
- Tracking issue: now points at #776 + PR #778

`docs/adr/README.md` ADR index gets an ADR-115 row in the
"Platform and UI" section with the same Accepted/Proposed split.

## Property-based fuzzing — mqtt::security

Added 5 proptest cases (each runs ~256 iterations per cargo-test
invocation, so ~1280 additional assertions per CI run):

- topic_segment_rejects_anything_with_wildcards_or_separators —
  random Unicode prefix/suffix + an injected '+', '#', NUL, or '/'
  MUST be rejected
- topic_segment_accepts_safe_alphabet — any string built solely from
  the safe alphabet MUST be accepted
- topic_segment_always_rejects_empty — invariant across seeds
- payload_size_check_is_monotonic — every size ≤ MAX is OK, every
  size > MAX errors with the exact size
- path_safety_rejects_nul_or_newline_anywhere — NUL/newline at any
  offset in the path MUST be rejected

`proptest` 1.5 added as dev-dep with default features off (no
proptest-derive needed). ~3 transitive crates added, dev-only.

Total lib tests: 410 → 415 passed, 0 failed, 1 properly ignored.

Refs #776, PR #778.

Co-Authored-By: claude-flow <ruv@ruv.net>

docs/adr/ADR-115-home-assistant-integration.md

@@ -2,12 +2,12 @@
 
 | Field | Value |
 |-------|-------|
-| **Status** | Proposed |
+| **Status** | **Accepted** (MQTT track P1–P7 + P8a + P9 + P10 shipped 2026-05-23 in PR #778, 410 lib tests, witness bundle VERIFIED) / **Proposed** (Matter SDK wiring P8b deferred to v0.7.1 per §9.10) |
 | **Date** | 2026-05-23 |
 | **Deciders** | ruv |
-| **Codename** | **HA-DISCO** (MQTT) + **HA-FABRIC** (Matter) |
+| **Codename** | **HA-DISCO** (MQTT) + **HA-FABRIC** (Matter) + **HA-MIND** (semantic primitives) |
 | **Relates to** | ADR-018 (CSI binary frame format), ADR-021 (ESP32 vitals), ADR-031 (RuView sensing-first), ADR-039 (edge vitals packet 0xC511_0002), ADR-079 (camera ground-truth), ADR-103 (cog-person-count), ADR-110 (ESP32-C6 firmware), ADR-114 (cog-quantum-vitals) |
-| **Tracking issue** | TBD — file under RuView issue tracker, link in §10 |
+| **Tracking issue** | [#776](https://github.com/ruvnet/RuView/issues/776) — implementation in PR [#778](https://github.com/ruvnet/RuView/pull/778) |
 | **Related issues** | [#574](https://github.com/ruvnet/RuView/issues/574) (mDNS for seed_url), [#760](https://github.com/ruvnet/RuView/issues/760) (sensing UI), [#761](https://github.com/ruvnet/RuView/issues/761) (HA competitor scan) |
 
 ---

docs/adr/README.md

@@ -89,6 +89,7 @@ Statuses: **Proposed** (under discussion), **Accepted** (approved and/or impleme
 | [ADR-035](ADR-035-live-sensing-ui-accuracy.md) | Live Sensing UI Accuracy and Data Transparency | Accepted |
 | [ADR-036](ADR-036-rvf-training-pipeline-ui.md) | Training Pipeline UI Integration | Proposed |
 | [ADR-043](ADR-043-sensing-server-ui-api-completion.md) | Sensing Server UI API Completion (14 endpoints) | Accepted |
+| [ADR-115](ADR-115-home-assistant-integration.md) | Home Assistant integration via MQTT auto-discovery + Matter bridge (HA-DISCO + HA-FABRIC + HA-MIND) | Accepted (MQTT track) / Proposed (Matter SDK P8b) |
 
 ### Architecture and infrastructure