chore: release v0.15.0

[emal-avala]

Bump workspace crates to 0.15.0.

Highlights since v0.14.0

• feat: 6 new bundled skills + parity roadmap additions (feat(skills,roadmap): 6 new bundled skills + parity roadmap additions #114)
• feat: interactive /uninstall command (feat: implement interactive /uninstall command #102)
• fix: Escape and Ctrl+C actually interrupt agent during streaming (fix: make Escape and Ctrl+C actually interrupt agent during streaming #106)
• fix(config): merge config layers at raw toml level (fix(config): merge config layers at raw toml level (#101) #110)
• deps: criterion 0.8, tree-sitter 0.26, tree-sitter-bash 0.25, ratatui 0.30, and more
• test: comprehensive e2e interrupt/cancellation coverage, Flutter client integration and Playwright E2E
• ci: minimum workflow permissions (CodeQL)

After merge, tag v0.15.0 to trigger the release workflow.

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