fix: provision DMC Cook worktree destinations

[chubes4]

Summary

• configure the generated DMC Homeboy provider with the generic absent-destination and ensure contract from Homeboy PR #10484
• add a resolver adapter that maps only typed worktree_not_found responses to dedicated exit 42
• preserve every unrelated DMC failure and its original status/output
• add supported DMC worktree creation argv and behavioral resolve -> ensure -> resolve coverage

Merge order

1. Merge fix(cook): classify missing provider worktrees for provisioning homeboy#10484.
2. Merge this PR.
3. Regenerate/deploy the wp-coding-agents Homeboy provider configuration and validate Cook from an absent destination.

Verification

• bash tests/homeboy-dmc-provider.sh
• bash -n lib/homeboy.sh scripts/homeboy-dmc-resolve.sh tests/homeboy-dmc-provider.sh
• bash tests/homeboy-components.sh
• bash tests/homeboy-project-id.sh
• bash tests/homeboy-agents-md.sh
• live DMC worktree add --help contract inspection
• git diff --check

Compatibility

Only typed DMC worktree_not_found becomes absence. Existing handles converge idempotently; malformed/provider/runtime failures stay fail-closed and never trigger ensure.

AI assistance

OpenAI GPT-5.6 Sol via OpenCode implemented the integration, corrected review findings against the live DMC contract, and independently verified the final adapter. Chris Huber reviewed and remains responsible for every line.

Fixes #310.
Related: Extra-Chill/homeboy#9908.