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feat: bbtool codegen — provides/consumes grammar + setter-injection emission (no wiring yet) (#814)

- add `consumes=<key>` to `// bbtool:init` grammar (wire_parse.py): marks fn
  as a void setter, mutually exclusive with server=true, never routes
  through the requires/provides hard-fail path
- reject `consumes=` values containing a comma (single-key only, not a csv
  list like provides=/requires=) — a bare typo would otherwise silently
  soft-skip instead of erroring
- add a sibling `// bbtool:provides key=<key> symbol=<symbol>` marker +
  ProvidesEntry record: a name/symbol declaration only, never an InitEntry,
  never entered into wire_graph.topo_sort
- add collect_provides_entries + _value_providers/_emit_consumes_call/
  _emit_entry to commands/wire.py: a second, parallel emission path that
  injects `{fn}({symbol});` when both provider and consumer are in the
  resolved composition, and silently drops the entry otherwise
- _value_providers raises WireError on a duplicate provides `key` declared
  by two composed components, mirroring the http_server "at most one
  provider" check, rather than silently last-winning
- wire collect_provides_entries + render_source's new provides_entries
  param into commands/codegen.py
- the existing http_server handle-threading path (_http_server_providers,
  __auto_type capture, _emit_call's bb_err_t convention) is untouched
- add wire_parse/wire/wire_graph test coverage for the new grammar and
  emission path, plus explicit re-runs of the http_server fixtures to
  lock zero regression

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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