Refactor selector system internals into parser/matcher/resolver modules

[thymikee]

Problem

src/daemon/selectors.ts is currently ~540 LOC and combines selector parsing/tokenization, matching/resolution, disambiguation scoring, and selector-chain generation.

Goal

Decompose selector system internals into focused modules while preserving selector DSL behavior.

Proposed split

• src/daemon/selectors-parse.ts
  • parse/tokenize/unquote/boolean parsing
• src/daemon/selectors-match.ts
  • selector and term matching primitives
• src/daemon/selectors-resolve.ts
  • fallback chain resolution + disambiguation scoring
• src/daemon/selectors-build.ts
  • selector-chain generation for replay/action recording
• Keep src/daemon/selectors.ts as thin public facade.

Acceptance criteria

• No selector DSL behavior changes.
• Existing exports keep signatures and semantics.
• New modules target <=300 LOC where practical.
• Existing selector + replay-heal tests pass unchanged.

Validation

• pnpm typecheck
• pnpm test:unit
• pnpm test:smoke