feat(core): add local operation selector and update docs

[samchon]

What changed

• Added a dependency-free local operation index in @agentica/core.
• Added IAgenticaSelectorConfig and config.selector support for llm/standard, local, hybrid, and auto selection modes.
• Wired selector modes into the existing select orchestration while keeping the default behavior as the existing LLM selector.
• Added focused tests for tokenization, weighted search, direct select:<operation> routing, required terms, schema/parameter matching, metadata hints, hidden operations, and registry versioning.
• Updated .wiki with the implementation record, AutoBe in-memory RAG notes, external references, verification strategy, roadmap, and worklog.
• Updated website docs and snippets to match current selector, event, history, and vector selector APIs.
• Excluded .wiki notes from root ESLint so research/working-memory markdown is not parsed as CI-gated source documentation.

Implementation notes

• local mode retrieves candidates from AgenticaOperationIndex and pushes them directly into the selection stack.
• hybrid mode narrows candidates locally, then asks the existing LLM selector to choose from that reduced catalog.
• auto mode keeps the LLM selector for smaller catalogs and switches to hybrid once the estimated schema character threshold is reached.
• fallback: "llm" preserves standard selector behavior when local search finds no candidates; fallback: "none" returns no local selection.
• MicroAgentica is unchanged.

Documentation

• Added /docs/core/selector.
• Rewrote core configuration, event, and history docs around the current public API.
• Reworked vector selector docs around @agentica/vector-selector, BootAgenticaVectorSelector, SQLite, PostgreSQL, and custom strategies.
• Removed stale @agentica/pg-vector-selector, agent.on("text"), AgenticaHistory.Text, and p.selections references from website docs/snippets.
• Added OpenAI official references for Function Calling, Tool Search, and Structured Outputs where relevant.

Validation

• pnpm --filter @agentica/core exec vitest run src/selector/AgenticaOperationIndex.spec.ts
• pnpm --filter @agentica/core exec tsc --noEmit
• pnpm --filter @agentica/core test -- --run
• pnpm --filter @agentica/core lint (passes with existing JSDoc warnings in packages/core/src/functional/*)
• pnpm lint:root
• pnpm dlx npm-run-all2 -p lint:* --aggregate-output (passes with existing warnings)
• git diff --check
• stale-reference grep for removed selector/event/history names
• pnpm --filter @agentica/website exec next build

CI status

All PR checks are passing on head 20f342ec.

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commit: d74b0dc