fix(release): 0.1.3 — doctor reads per-project port

[Astralchemist]

Closes #17. Published as rig-constellation@0.1.3 (latest).

Change

rig doctor was probing a hardcoded port 7474, but since 0.1.2 each project gets a stable per-project port (.rig/config.json). Doctor now resolves the port the same way serveWeb does and probes/labels that port.

• Exported resolvePort (+ resolveProjectName) from @rig/web and reused it in doctor.ts (no duplicated config-read logic).
• Busy-port message now notes the free-port fallback instead of sounding alarming.
• Added __tests__/port-resolution.test.ts: resolvePort precedence (flag → config → 7474), resolveProjectName, and stablePort determinism/range.

Verification

• bun run build, gen:check, check:compat (0 breaking), check:migrations, bun test (201 pass / 0 fail) — all green.
• Headless: a project with stable port 7491 now shows ✓ port 7491 available for \rig serve --web``.

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