Release v0.7.0

[JRS1986]

Summary

Cuts the v0.7.0 release. Three small file changes following the v0.6.0 pattern:

• CHANGELOG.md — promote [Unreleased] to ## [0.7.0] — 2026-05-28.
• pyproject.toml — version bump 0.6.0 → 0.7.0.
• uv.lock — refresh.

What's in 0.7.0

Removed (breaking)

• `--tool both` — replace with `--tool opencode,openclaude`
• `_normalize_persisted_intake` back-fill helper for legacy `project.json`
• `IntakeAnswers.agent` property — use `tools[0]`

Changed

• `probe_hardware()` cached at `$XDG_CACHE_HOME/coding-scaffold/hardware.json` with 1h TTL. Warm-call perf: doctor 243→78ms (3.1×), pilot 235→79ms (3.0×). New `--no-probe-cache` flag.
• `CODING_TOOLS` / `VALID_TOOLS` consolidated to a single source of truth in `intake.py`.

Tests

• pytest-xdist enabled. Suite ~22s → ~3s (~7×). 637 tests passing.

Test plan

• `uv run pytest -q` — 637 pass.
• `uv run ruff check src/ tests/` — clean.
• No code changes — release-only commit.