* fix(rpc): validate task provider identity fields
Validate provider-specific field types while preserving nullable scopes and unknown identity fields. Record the producer census and pin validation with regression tests.
Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb
* fix(rpc): reject a blank GitHub owner or repo
normalizeTaskProviderIdentity treats a blank owner or repo as no identity at
all, but the schema accepted '' and whitespace-only, so the two disagreed about
the same payload. Refined rather than trimmed: trimming would rewrite the
parsed value and change what the handler receives.
Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb
* docs(rpc): re-measure the identity evidence counts
The blank-field commit added seven tests, so the recorded 74/16/58 described the
commit before it. Re-ran both: 81 tests, and the discriminant-only mutation now
gives 17 failures / 64 passes.
Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb
* docs(rpc): correct the remaining stale gate count
The blank-field commit moved the full-RPC total too; 2,463 was the count before
it. Re-ran: 278 files, 2,470 passed, one skipped.
Claude-Session: https://claude.ai/code/session_01JNnE9qzUZMMnqpZWCqM3nb
