Preserve localLLM support after master merge

ci: avoid duplicate release changelog links

ci: generate release changelog body

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Phase 5a — BYOP orchestration foundation (code complete, no user-visi…

…ble change yet)

Adds the data layer + filter helpers + LLMPreferences plumbing + submit-time
validator needed for BYOP models to appear in agent orchestration. Behavior
change is gated on Phase 5b (settings UI) + 5c (modal + Local env injection)
+ 5d (Remote credential bridge), all queued.

See specs/multi-local-llm/spec-phase-5.md and plan-phase-5a.md.

BYOP UX polish — per-model remove button now labeled '× Remove model'…

… for discoverability

Merge master into multi-local-llm — all BYOP features preserved (Phas…

…es 1a-4d)

BYOP multi-local-llm — all phases code complete (1a through 4d)

Phase 4d — Dedicated compaction model (code complete)

ProviderAdapter trait + Test connection probe — Phase 2 complete.

Scope:
- Move AgentProviderApiType into the ai crate (wire-protocol layer)
- Thread api_type into LocalProviderConfig (Default impl + models_list_url helper)
- Introduce ProviderAdapter + StreamDecoder traits (crates/ai/src/local_provider/adapters/)
- Implement OpenAiAdapter wrapping existing wire code; OpenAiSseAdapter gains
  forwarding `impl StreamDecoder`
- Stub adapters for OpenAiResp / Gemini / Anthropic / Ollama / DeepSeek
  return UnsupportedApiType via select_adapter (exhaustive match — no _ arm
  so Phase 3 variant additions trigger a compile error at the dispatcher)
- Refactor run_chat_turn + run_summarizer_turn to delegate to the selected
  adapter; synthesize_stream takes Box<dyn StreamDecoder>
- LocalRunError gains Adapter variant; SummarizerError gains Adapter(String)
- Add per-provider "Test connection" probe button to AgentProvidersWidget
  with ProbeUiState (Idle | Probing | Ok | Failed) visualization; state is
  invalidated by base_url / api_key / api_type edits to avoid lying about
  stale results.

No user-visible behavior change for OpenAi-compatible endpoints — the
trait is purely an internal indirection. 341/341 ai-crate tests pass
(was 324; +14 trait/probe tests + 3 models_list_url tests).

Note: this tag was originally reserved in the spec README for Phase
1b-4 (legacy cleanup); that milestone will need a different tag
(v0.2.1 or v0.3.0 TBD).