DRV-42: copier update to template v0.7.0 (fix BOOL variable format)

[svc-finitelabs]

Fixes DRV-42 / closes #55.

Summary

`copier update` from template v0.5.0 → v0.7.0. The only material change in driver behavior comes from template v0.6.0: BOOL variables now serialize as `"0"`/`"1"` instead of `"true"`/`"false"`, which is what Control4 actually expects. Without this, BOOL variables created by the driver (the ` State` variable for `binary_sensor` and `switch`, plus all BTHome BOOL sensors) showed `False` permanently in the Variables Agent even though the value was changing under the hood.

Template v0.7.0 is a one-line copier housekeeping change (adds the answers-file template so future `copier update` runs persist `_commit` and any new answers).

What changed in the driver

Only two files:

• `src/lib/values.lua` — rendered output of the updated template.
• `.copier-answers.yml` — `_commit` bumped to v0.7.0, `lib_modules` answer added (template v0.6.0 introduced this question; defaulted to the full module set so nothing is excluded).

Why this is safe

• The new `values:update` signature is backward-compatible with every existing callsite in this repo:
  • 3-arg calls (`values:update(name, value, type)`) — unchanged behavior, except now `nil` as the callback arg means "leave the OVC handler alone" instead of "clear it". Callers that never registered a callback (binary_sensor, sensor, etc.) are unaffected.
  • 4-arg calls with a `function` (`switch`, `text`, `select`, `number`, `date`, `time`, `datetime`) — still register the callback. No behavior change for the user.
• BOOL serialization fix is the documented bug fix; the value path through `toboolean` already produced a Lua boolean, this just stringifies it the way C4 wants.
• A side-effect of the v0.6.0 patch: inbound state pushes no longer clobber a registered OVC callback. That fixes a latent issue where a state arriving while a programming-managed callback was wired would silently drop the callback.

Verification

• `make build` runs clean end-to-end (preprocess → gen-squishy → update-xml → docs → fmt → package → zip). No dirty tree.
• One stylua nit collapsed a multi-line `log:trace` call to a single line (template ships it multi-line, stylua at 120 cols folds it). Amended into this commit; will file a follow-up to fix the template formatting so future `copier update` runs stop drifting.

Out of scope (follow-up)

The same template fix needs to roll into `control4-mqtt`, `control4-home-connect`, and `control4-finite-labs-essentials` (all pinned at v0.5.0). I'll handle those as separate per-repo `copier update` PRs after this one is signed off — touching one driver at a time keeps the blast radius small if anything regresses.