feat(suggest): enumerate methods + report zero-match globs (#27, #29, #30)

[Connorrmcd6]

Summary

surf suggest is the adoption on-ramp, but two gaps undercut it:

• It only proposed top-level functions — on method-oriented Python/Go codebases that surfaced ~1% of the public API (Python: suggest ignores class methods — only proposes top-level functions #27, Go: suggest only proposes top-level functions, skips all methods #29).
• A typo'd / zero-match glob printed the same no unanchored ... success as a clean run, so mistakes looked like "all good" (suggest: typo'd / zero-match globs report "no unanchored functions" (look like success) #30).

Changes

• surf_core::public_symbols — new enumeration returning resolvable anchor segment paths:
  • Python class methods as Class > method (async/sync mirrors de-duped, leading-underscore excluded, decorated methods included).
  • Go methods as Type > Method, matched by exported receiver type (pointer *T and value T receivers both work).
  • Rust impl / TS class methods remain out of scope — top-level only (conscious boundary; the resolver already handles them when hand-anchored).
• Coverage granularity fix — suggest now keys covered anchors on the full file > seg > seg path, so anchoring one method no longer hides its siblings.
• Glob feedback — per-glob match tallies: a glob matching no files warns on stderr and exits non-zero only when every glob was empty (partial matches still succeed); a glob matching only unsupported-language files gets a softer note. JSON stdout stays machine-parseable (warnings are stderr-only).

public_fns (used by lint's under-coverage warning) is unchanged.

Verification

• New unit tests for Python/Go method enumeration, full-path coverage, and glob reporting; full suite green.
• End-to-end: suggested method anchors (src/store.go > Builder > Set, src/api.py > Client > fetch) resolve, verify, and check clean.
• Dogfood surf check on this repo stays green (the suggest hub prose was updated to match).

Closes #27, closes #29, closes #30.

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