chore: release v0.3.0

[saucam]

Version bump + changelog for the v0.3.0 release. Merge this, then cut the v0.3.0 GitHub release/tag — the tag triggers the npm publish (root + @codeoid/protocol + @codeoid/core).

Versions

Package	From	To
codeoid (root)	0.2.0	0.3.0
@codeoid/protocol	0.1.0	0.2.0
@codeoid/core	0.1.0	0.2.0

Internal dep ranges bumped so resolution holds after publish: root's dep and @codeoid/core's peer dep on @codeoid/protocol → ^0.2.0. Lockfile is unaffected (internal packages resolve via workspace:).

Changelog

Cut [0.3.0] from [Unreleased] — the multi-provider backends, mid-session provider switching, pi backend, and the provider extension surface — and folded in this cycle's work: fork-sidebar fix (#174), package.json-sourced --version + bun run smoke gate (#175), and the README/docs restructure + multi-harness positioning (#176).

Verification

• bun run typecheck clean; bun run build OK.
• Version coherence: built codeoid --version → 0.3.0 == package.json.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.90%. Comparing base (1c7155b) to head (056e0fa).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #177   +/-   ##
=======================================
  Coverage   84.90%   84.90%           
=======================================
  Files         106      106           
  Lines       18678    18678           
=======================================
  Hits        15858    15858           
  Misses       2820     2820           

Flag	Coverage Δ
daemon	84.90% <ø> (ø)

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