release: prepare Solodeveling 0.3.0

[ohmiler]

Summary

• streamline clear Standard frontend and backend delivery
• add fail-closed backend Quick routing and shared boundary guidance
• add the pinned no-skill benchmark harness and the 0.3.0 routing pilot
• align Python, npm, native metadata, docs, and release notes on 0.3.0
• record the verified local Python and Windows x64 candidate

Verification

• 281 Python tests passed for source revision d0e9bcb
• skill-suite and protocol validation passed
• npm launcher tests passed with one expected Windows symlink skip
• Python candidate, fresh-wheel smoke, and Windows x64 native smoke passed
• closeout memory validation passed; focused memory regressions: 19 passed

Release boundary

• live routing remains unverified because tenant policy denied the three calls
• the prior owner acceptance covers local candidate inspection only and expires before public release
• five native targets, npm release tarball, complete release set, and attestations require the main-only candidate workflow after merge
• this PR does not authorize merge, candidate invocation, tag, GitHub Release, registry publication, or production mutation