feat: roadmap batch (2026-06-19) — solar/linear-light/dither/nanoleaf + integrations

Eight roadmap features from the 2026-06-19 review, each a full vertical
(backend + tests + frontend + i18n en/ru/zh); ~67 new unit tests:

- automations: SolarRule sunrise/sunset trigger (new utils/solar.py, shared
  with the daylight cycle; window logic mirrors TimeOfDayRule)
- ci: best-effort arm64 multi-arch Docker manifest via QEMU + docker manifest
  (release.yml; amd64 path untouched, continue-on-error)
- game-integration: wire the orphaned LoLPoller via a LoLPollManager + a shared
  runtime_state module (poll lifecycle on enable/CRUD/startup/shutdown)
- ui: color-harmony gradient generator (complementary/analogous/triadic/...)
- effects: audio-reactive palette modulation (new audio_energy_tap; brightness/
  saturation modulation across all 12 procedural effects)
- capture: linear-light blending + spatio-temporal dithering, opt-in per
  calibration (new utils/linear_light.py, utils/dither.py)
- devices: Nanoleaf extControl v2 per-panel UDP streaming (per_panel mode)

Also bundles the pending 2026-06-18 production-review fixes and other
in-progress work already in the working tree (manual-trigger rule, etc.),
since they share files and could not be cleanly separated.

Gate: ruff + tsc clean; pytest 2654 passed / 2 skipped. The single failing
test (automation manual_trigger handler coverage) is a separate in-progress
item owned elsewhere, intentionally left as-is.

CLAUDE.md

@@ -2,9 +2,40 @@
 
 ## Code Search
 
-**If `ast-index` is available, use it as the PRIMARY code search tool.** It is significantly faster than grep and returns structured, accurate results. Fall back to grep/Glob only when ast-index is not installed, returns empty results, or when searching regex patterns/string literals/comments.
+**Priority order: `vex` (PRIMARY) → `ast-index` (fallback) → Grep/Glob (last resort).** This repo has a fully-featured `.vex.toml` index. Use vex first for any symbol/definition/usage/call-graph lookup. Fall back to ast-index only when vex legitimately can't help, and to Grep/Glob only for regex patterns, string literals, comments, config files, or unparsed languages.
 
-**IMPORTANT for subagents:** When spawning Agent subagents (Plan, Explore, general-purpose, etc.), always instruct them to use `ast-index` via Bash for code search instead of grep/Glob. Example: include "Use `ast-index search`, `ast-index class`, `ast-index usages` etc. via Bash for code search" in the agent prompt.
+**IMPORTANT — use ALL vex indexing features.** The index is built with every capability enabled, and queries must take advantage of them. Keep them ON and exploit them:
+
+| Capability | Status | Powers |
+| ---------- | ------ | ------ |
+| Semantic embeddings (`jina-code`, 768-dim) | ON | `vex search` (semantic channel), `similar`, `find_similar`, `duplicates` |
+| Call graph | ON | `vex callers`, `callees`, `paths`, `reachable`, `bundle --mode pr-impact` |
+| BM25 | ON | hybrid RRF text channel in `vex search` |
+| Pattern index | ON | `vex pattern` AST-shape matching |
+| C++ includes | ON | include-graph resolution |
+| Body tokens (incremental HNSW) | ON | fast incremental reindex |
+| History | ON | `vex history`, `vex diff <rev>` blame/evolution queries |
+
+**In-session, use the `mcp__vex__*` MCP tools** (`search`, `show`, `usages`, `callers`, `callees`, `bundle`, `outline`, `implementations`, `similar`, `grep`, `status`, etc.) — MCP output is far cheaper in tokens than `Bash("vex …")`. Drop to Bash `vex` only for CLI-only features (`pattern`, `diff`, `paths`, `reachable`, `bundle`, `history`, `--strict`/`--why` flags), for subagent prompts, or for shell composition.
+
+```bash
+vex search "query" --semantic             # Hybrid semantic + BM25 search
+vex show <Symbol>                          # Definition body (prefer over Read)
+vex usages <Symbol> --strict               # Reference sites (AST-precise on T1 langs)
+vex callers <Function>                     # Call sites (function-scoped)
+vex callees <Function>                     # Outgoing calls
+vex paths --from <A> --to <B>              # Multi-hop call-graph path
+vex bundle --mode pr-impact --base master  # Changed symbols + callers + reachable tests
+vex pattern '$X async fn returning Response'  # AST-shape (metavariables)
+vex diff master                            # Symbol-level branch diff
+vex history <Symbol>                        # Commit evolution of a symbol
+```
+
+**Maintenance:** the index has `auto_update = true`, so it refreshes on stale queries. After a `vex self-update`, rerun `vex index --history --semantic --embedder jina-code --device cuda` so newly-added extractors populate and all features stay enabled. Verify with `vex status` — every capability line should read `yes`.
+
+**IMPORTANT for subagents:** Subagents don't inherit MCP. When spawning Agent subagents (Plan, Explore, general-purpose, etc.), instruct them to use `vex` via Bash for code search (e.g. include "Use `vex search`, `vex show`, `vex usages`, `vex callers` via Bash for code search; ast-index is the fallback"). Don't tell them to default to grep/Glob.
+
+**Fallback — `ast-index`** (use only when vex is unavailable):
 
 ```bash
 ast-index search "Query"                  # Universal search