Stabilize final gate before release checkpoint

Resolve the G012 evidence gate by fixing permission-mode regressions, platform-sensitive tests, and the clippy surface that blocked an all-targets verification run.

Constraint: G012 final gate required docs, board, full workspace tests, and clippy -D warnings evidence before checkpointing.

Rejected: documenting the worker-2 gate failure as an accepted gap | the failing tests and lints were locally reproducible and fixable.

Confidence: high

Scope-risk: moderate

Directive: Preserve read-only permission requirements for read/glob/grep tools; write/edit remain workspace-write or danger-full-access when outside the workspace.

Tested: python3 .github/scripts/check_doc_source_of_truth.py; python3 .github/scripts/check_release_readiness.py; python3 scripts/validate_cc2_board.py --board .omx/cc2/board.json; python3 .omx/cc2/validate_issue_parity_intake.py .omx/cc2/issue-parity-intake.json; cargo fmt --manifest-path rust/Cargo.toml --all -- --check; cargo check --manifest-path rust/Cargo.toml --workspace; cargo test --manifest-path rust/Cargo.toml --workspace -- --nocapture; cargo clippy --manifest-path rust/Cargo.toml --workspace --all-targets -- -D warnings

Not-tested: live network provider smoke tests and remote PR/issue mutations.

rust/crates/mock-anthropic-service/src/lib.rs

@@ -248,7 +248,6 @@ fn detect_scenario(request: &MessageRequest) -> Option<Scenario> {
                 .split_whitespace()
                 .find_map(|token| token.strip_prefix(SCENARIO_PREFIX))
                 .and_then(Scenario::parse),
-            InputContentBlock::Thinking { .. } => None,
             _ => None,
         })
     })