Fletch v0.7.15

What's Changed

• feat(presenters): add dedicated Codegraph presenter for mcp__codegraph tools by @alchaplinsky in #504
• feat(commands): support Codex custom prompts as slash commands by @alchaplinsky in #505
• feat(effort): allow changing reasoning effort mid-conversation by @alchaplinsky in #506
• feat(effort): interactive effort control in the chat composer by @alchaplinsky in #507
• feat(model): allow changing the model mid-conversation (backend) by @alchaplinsky in #508
• feat(model): interactive model picker in the chat composer by @alchaplinsky in #509
• refactor(effort): make reasoning effort session-level for all providers by @alchaplinsky in #510
• chore: bump version to 0.7.15 by @alchaplinsky in #511

Full Changelog: v0.7.14...v0.7.15