chore(release): open dev at 2.76.0 before releasing 2.75.0

[github-actions]

Summary

2.75.0 is about to be released. Merging this first means dev already outranks the new tag when it lands, so neither dev nor any open pull request ever inherits the version-line failure. release.yml refuses to publish until this has merged.

This moves dev to 2.76.0 in package.json and the desktop version
sources (tauri.conf.json, Cargo.toml, and the opencodex-desktop entry of Cargo.lock).

Opened automatically by .github/workflows/dev-version-bump.yml. The same
version-line move was previously done by hand in 32529c2, e4a85d1, 076ad30, and
befcac3.

Verification

The workflow proved 2.75.0 has neither a Git tag nor an npm publication, and bun test tests/ci-workflows/release-version-line.test.ts proved the chosen development version is unused.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

Review readiness checklist

This PR stays in draft until every box below is ticked. Tick all four boxes once the requirements are met:

• Required local validation passed; commands, results, and any full-suite exception are documented.

• I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).

• I resolved all correct Codex and CodeRabbit findings.

• My PR is ready for review.

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[lidge-jun]

Maintainer integration into dev by @lidge-jun: release pre-move for 2.75.0 (MAINTAINERS.md). The diff is exactly the four version sources, each 2.75.0 -> 2.76.0. The release candidate is frozen at dev 82a4955, whose Cross-platform CI run 36808122713 succeeded; the Cross-platform run for this metadata-only head is skipped by the owner's single-final-run instruction.

[github-actions]

⏳ DRAFT

• hygiene: unsponsored_surface.

What to do

• Fix unsponsored_surface — This changes an authentication, workflow, release-automation, or dependency surface. MAINTAINERS.md requires security review for these; ask a maintainer to apply maintainer-sponsored once they have reviewed it. Paths: package.json.
• Tick all four boxes in the PR description once you're done (currently 0/4).

Review readiness checklist

• ⬜ Required local validation passed; commands, results, and any full-suite exception are documented.
• ⬜ I pushed my PR to a recent dev commit (at most 10 behind; a maintainer may still ask for the exact tip before merge).
• ⬜ I resolved all correct Codex and CodeRabbit findings.
• ⬜ My PR is ready for review.

0/4 boxes ticked.

Automatic draft conversion failed (token cannot change draft status). Please convert this pull request to a draft manually. The required enforce-target check will keep failing until every issue above is resolved.