Adds ship provenance detection and emission in execute_bash_async():
- Detects git push to main/master commands
- Captures current branch, HEAD commit, git user as actor
- Emits ship.prepared event with ShipProvenance payload
- Logs to stderr as interim routing (event stream integration pending)
This is the first wired provenance event — schema (§4.44.5) now has
runtime emission at actual git operation boundary.
Verified: cargo build --workspace passes.
Next: wire ship.commits_selected, ship.merged, ship.pushed_main events.
Refs: §4.44.5.1, ROADMAP #4.44.5
This adds crate-level and type-level Rustdoc to the runtime crate's core exported types so downstream crates and contributors can understand the session, prompt, permission, OAuth, usage, and tool I/O primitives without spelunking every implementation file.
Constraint: The docs pass needed to stay focused on public runtime types without changing behavior
Rejected: Add blanket docs to every public item in one sweep | larger churn than needed for a targeted docs pass
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: When exporting new runtime primitives from lib.rs, add a short Rustdoc summary in the defining module at the same time
Tested: cargo build --workspace; cargo test --workspace
Not-tested: rustdoc HTML rendering beyond doc-test coverage
