feat(sdk,sdkx): v0.3.0 cutover — delete deprecated v0.2.x surface [skip-tag:sdk] [skip-tag:sdkx]

[lIang70]

Summary

Closes the v0.2.x deprecation window in a single coordinated cut.
Every symbol that lived in a per-package deprecated.go shim during
v0.2.x is removed; the index files themselves are deleted. See
docs/migrations/v0.3.0.md
for the full per-symbol map.

sdk

• Delete sdk/workflow and sdk/graph/adapter (workflow ↔ graph bridge).
• sdk/llm: drop the RunRound / RoundStream / RoundConfig family,
  CapsMiddleware / WithExtraCaps / LookupModelCaps shims, and
  ModelInfo.Caps auto-promotion.
• sdk/graph: collapse runner onto engine.Engine — drop the internal
  Executor interface, ErrInterrupt, WithEventBus /
  WithStreamCallback / WithCheckpointStore options, the
  busOnlyHost shim, and VarMessages / VarQuery / VarAnswer.
  Refactor llmnode.Config.MessagesKey → MessagesChannel (a pure
  typed-channel name) and remove QueryFallback. Add
  knowledgenode.Config.QueryKey.
• sdk/engine: rename MainChannel from "" to "__main_channel"
  with a RestoreBoard migration shim for old checkpoints; reserve
  the __ prefix for engine-owned board keys.
• sdk/knowledge: delete the v0.1 surface (Document, Chunk,
  SearchResult, SearchOptions, DocInput, Store / FSStore /
  RetrievalStore / CachedStore and their With* options,
  ChunkDocument / ScoreChunk / RankResults / RRFMerge,
  ChangeNotifier / Reloader, KnowledgeConfig / KnowledgeNode
  and the matching tools); flip ContextLayer ↔ Layer with
  ContextLayer retained as a backward-compatible alias; remove
  ModeSemantic; everything routes through *Service now.
• sdk/history: remove Closer.Close / compactor.Close,
  SummaryCacheStore, and the RecoverArchive / SaveManifest
  top-level helpers; relocate ToolDeps / RegisterTools /
  historyExpand|Compact to sdkx/tool/history.
• sdk/retrieval: drop SearchRequest.ReturnRaw and
  SearchResponse.RawByRetriever.
• sdk/script/bindings: drop NewStreamBridge, NewRunBridge,
  AgentStepBindings, and the BuildEnv preset; NewRunInfoBridge
  is the surviving run-metadata bridge.
• sdk/model: add LastByRole helper for role-scoped reverse scans
  (replaces ad-hoc loops in node code that previously coupled board
  vars to channel contents through magic keys).

sdkx

• sdkx/tool/{history,kanban} take ownership of the relocated tool
  implementations and context keys. Public signatures stay identical
  for downstream callers that already swapped imports during the
  v0.2.x window.
• sdkx/knowledge/watcher is removed alongside the deprecated
  ChangeNotifier. Durable watchers must produce ChangeEvent
  values for EventReloader directly.

Docs

• Expand docs/migrations/v0.3.0.md to cover every removed symbol,
  including the additive surface accumulated across v0.2.x
  (engine.StreamRouter / Resumer / LoadAndResume, agent.Handoff,
  workspace.Capabilities, retrieval/scoring helpers, telemetry
  AttrXxx, errdefs boundary normalisation, llm image/audio caps).
• Enable GitHub Pages from docs/ with jekyll-theme-cayman + a
  landing docs/index.md linking to the migration guide.
• Whitelist docs/_config.yml and docs/index.md in .gitignore.

Tagging

[skip-tag:sdk] and [skip-tag:sdkx] in the title and HEAD commit
defer auto-tag deliberately. The release coordinator will hand-tag
sdk/v0.3.0 and sdkx/v0.3.0 in a coordinated cut once this PR
merges, per the schedule documented in docs/migrations/v0.3.0.md
(Timeline section).

Test plan

• make vet — green across sdk, sdkx, vessel, voice,
  cmd/vesseld, bench, examples/voice-pipeline,
  tests/conformance, tests/quality/{knowledge,vessel},
  tests/e2e/{vesseld,retrieval}.
• cd sdk && go test ./... — green (knowledge, history, graph,
  llm, script, engine, agent, recall, retrieval, model).
• CI to confirm parity on Linux runners.
• Post-merge: hand-tag sdk/v0.3.0 and sdkx/v0.3.0.

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