release: v0.7.5

[danshapiro]

Summary

• mark the current main candidate as v0.7.5
• update the README install tag and docs mock version text
• keep the release candidate scoped to version-facing metadata only

Change notes

• Microsoft Amplifier support: Freshell can now launch Amplifier as a coding CLI agent, index and resume Amplifier sessions, show Amplifier activity state, use the Amplifier provider icon, and inject Freshell MCP setup when the Amplifier bundle exposes tool-mcp.
• Session visibility: provider-generated titles are preserved, stale generated-title overrides are cleaned up, Amplifier activity sidecars update session recency, and sidebar/search pagination can reach sessions beyond the first 50 matches.
• Claude titles: Claude-generated session summaries are indexed and preferred correctly without overwriting provider titles.
• Codex reliability: Codex proxy/fork handoffs and large-response handling are hardened.
• Build and repo hygiene: worktree server build output, invalid .git directory detection, and repository root layout are cleaned up.

Verification

• FRESHELL_TEST_SUMMARY="v0.7.5 release version verify" npm run verify