Keep local clawhip artifacts from tripping routine repo work

Dogfooding kept reproducing OMX team merge conflicts on
`.clawhip/state/prompt-submit.json`, so the init bootstrap now
teaches repos to ignore `.clawhip/` alongside the existing local
`.claw/` artifacts. This also updates the current repo ignore list
so the fix helps immediately instead of only on future `claw init`
runs.

Constraint: Keep the fix narrow and centered on repo-local ignore hygiene
Rejected: Broader team merge-hygiene changes | unnecessary for the proven local root cause
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: If more runtime-local artifact directories appear, extend the shared init gitignore list instead of patching repos ad hoc
Tested: cargo fmt --all --check
Tested: cargo clippy --workspace --all-targets -- -D warnings
Tested: cargo test --workspace
Tested: Architect review (APPROVE)
Not-tested: Existing clones with already-tracked `.clawhip` files still need manual cleanup
Related: ROADMAP ultraworkers#75

Author: Yeachan-Heo

.gitignore

@@ -8,4 +8,5 @@ archive/
 # Claw Code local artifacts
 .claw/settings.local.json
 .claw/sessions/
+.clawhip/
 status-help.txt

ROADMAP.md

@@ -520,3 +520,5 @@ Model name prefix now wins unconditionally over env-var presence. Regression tes
 73. **Session timestamps are not monotonic enough for latest-session ordering under tight loops** — **done (verified 2026-04-12):** runtime session timestamps now use a process-local monotonic millisecond source, so back-to-back saves still produce increasing `updated_at_ms` even when the wall clock does not advance. The temporary sleep hack was removed from the resume-latest regression, and fresh workspace verification stayed green with the semantic-recency ordering path from #72. **Original filing below.**
 
 74. **Poisoned test locks cascade into unrelated Rust regressions** — **done (verified 2026-04-12):** test-only env/cwd lock acquisition in `rust/crates/tools/src/lib.rs`, `rust/crates/plugins/src/lib.rs`, `rust/crates/commands/src/lib.rs`, and `rust/crates/rusty-claude-cli/src/main.rs` now recovers poisoned mutexes via `PoisonError::into_inner`, and new regressions lock that behavior so one panic no longer causes later tests to fail just by touching the shared env/cwd locks. Source: Jobdori dogfood 2026-04-12.
+
+75. **`claw init` leaves `.clawhip/` runtime artifacts unignored** — **done (verified 2026-04-12):** `rust/crates/rusty-claude-cli/src/init.rs` now treats `.clawhip/` as a first-class local artifact alongside `.claw/` paths, and regression coverage locks both the create and idempotent update paths so `claw init` adds the ignore entry exactly once. The repo `.gitignore` now also ignores `.clawhip/` for immediate dogfood relief, preventing repeated OMX team merge conflicts on `.clawhip/state/prompt-submit.json`. Source: Jobdori dogfood 2026-04-12.

rust/crates/rusty-claude-cli/src/init.rs

@@ -9,7 +9,7 @@ const STARTER_CLAW_JSON: &str = concat!(
     "}\n",
 );
 const GITIGNORE_COMMENT: &str = "# Claw Code local artifacts";
-const GITIGNORE_ENTRIES: [&str; 2] = [".claw/settings.local.json", ".claw/sessions/"];
+const GITIGNORE_ENTRIES: [&str; 3] = [".claw/settings.local.json", ".claw/sessions/", ".clawhip/"];
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum InitStatus {
@@ -375,6 +375,7 @@ mod tests {
         let gitignore = fs::read_to_string(root.join(".gitignore")).expect("read gitignore");
         assert!(gitignore.contains(".claw/settings.local.json"));
         assert!(gitignore.contains(".claw/sessions/"));
+        assert!(gitignore.contains(".clawhip/"));
         let claude_md = fs::read_to_string(root.join("CLAUDE.md")).expect("read claude md");
         assert!(claude_md.contains("Languages: Rust."));
         assert!(claude_md.contains("cargo clippy --workspace --all-targets -- -D warnings"));
@@ -407,6 +408,7 @@ mod tests {
         let gitignore = fs::read_to_string(root.join(".gitignore")).expect("read gitignore");
         assert_eq!(gitignore.matches(".claw/settings.local.json").count(), 1);
         assert_eq!(gitignore.matches(".claw/sessions/").count(), 1);
+        assert_eq!(gitignore.matches(".clawhip/").count(), 1);
 
         fs::remove_dir_all(root).expect("cleanup temp dir");
     }