chore(release): bump workspace version to 0.6.0

[Ju571nK]

Minor release bump (0.5.1 → 0.6.0), single workspace version field + Cargo.lock.

Tagging v0.6.0 after this merges triggers release.yml to build artifacts.

Changes since v0.5.1

Features

• assess pre-flight risk check — CLI + MCP tool (feat: assess primitive — callable pre-flight risk check (CLI + MCP tool) (#149) #150)
• OpenClaw skill + Hermes toolset glue for assess (feat: OpenClaw skill + Hermes toolset glue for the assess pre-flight (#151) #152)
• TrustFall: project-scope MCP auto-execution detection (feat(ai_guard): detect project-scope MCP auto-execution (TrustFall) (#145) #153)
• AI Guard scans agent instruction files for injection directives (feat(ai_guard): scan agent instruction files for injection directives (#146) #155)
• Antigravity install is static-posture-only by default (feat(sigil-hook): Antigravity install is static-posture-only by default (#112) #157)
• Windows hook-decide over named pipe — enforce works on Windows (feat(hook): Windows hook-decide over named pipe — enforce works on Windows (#162) #163)

Fixes

• rule-packs.yaml watcher re-arm + transient empty read (fix(agent): rule-packs.yaml watcher re-arm + transient empty read (#135) #142)
• non-root XDG fallback for state-db/events/policy paths (fix(agent): non-root XDG fallback for state-db/events/policy paths (#159) #160)
• newcomer-UX papercuts: clean-machine doctor, pathful errors, --version (fix: newcomer-UX papercuts — clean-machine doctor, pathful errors, --version (#161) #164)

Verification

• No hardcoded version strings in source/tests → bump is snapshot-safe.
• cargo fmt --all --check, cargo clippy --workspace --all-targets --all-features -D warnings, cargo test --workspace (exit 0) — all green locally.
• main HEAD CI (13ba776) green before cutting.

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