Persist learned role-pitch maps; add singleton guard for re-launches

[wretcher207]

Summary

Two lifecycle fixes from internal review. Independent of #1 — both branch from main and can land in either order.

C3 — Learn from Selection now persists

Old code did table.insert(ROLE_MAP[active_role], pitch) in memory and never wrote it anywhere. Restart Reaper → the learned mapping is gone.

Fix:

• save_settings now writes rolemap_<role> ExtState entries (comma-separated pitch list).
• load_settings reads them and mutates the module-level ROLE_MAP as a documented side effect. Roles with no stored entry keep their built-in defaults, so future versions adding new roles aren't broken by old persisted state.
• Learn from Selection auto-saves the moment a new pitch is added. The user does not have to remember to click Save Settings afterward.

C9 — Singleton guard against duplicate launches

run() called reaper.ImGui_CreateContext unconditionally. Re-firing the toolbar action while a previous instance was still running opened a second window with its own context.

Fix:

• Heartbeat stamp via SetExtState(SCRIPT_ID, "instance_heartbeat", time_precise) at the top of every frame.
• New launches check singleton_can_start() — if the last stamp is < 2s old, show a message and bail. If the previous run died (no heartbeat for 2s+), proceed.
• reaper.atexit(singleton_release) clears the flag on normal script exit.
• Added cached _ctx with ValidatePtr so a stale ref is replaced rather than appended to. Useful when the Lua state persists across script reloads; harmless when it doesn't.

Test plan

• Open the script, click Learn from Selection on a role you haven't customized, then quit Reaper and reopen. The learned pitch should still be in the role.
• Verify defaults: delete the ExtState rolemap_Kicks entry, launch the script. Kicks should be {35, 36} again.
• Launch the script. While the window is open, fire the toolbar action a second time. A modal should say "DeHumanizer Pro is already running." instead of opening a duplicate.
• Close the window. Wait 2 seconds. Launch again. It should open normally.
• Force-kill the script mid-defer (no heartbeat). After 2 seconds, a fresh launch should succeed.
• luac -p already verified on both file copies.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2d5e59e7-c3b7-4b4f-90e8-73cb169ca7ce

📥 Commits

Reviewing files that changed from the base of the PR and between 0f8aa62 and 6543b2c.

📒 Files selected for processing (2)

• Scripts/dehumanizer-pro.lua
• dehumanizer-pro.lua

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/persist-rolemap-singleton-guard

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