fix: recover rejected scheduler dispatches in v0.5.23

[ByBrawe]

Summary

Researching current OpenCode 1.18.15 showed an important distinction: opencode-loop's scheduler uses the synchronous session.prompt/session.shell APIs but deliberately does not await their long-running promises. The existing fireSdk() helper logged a rejection and then the scheduler still treated the run as active until stale recovery.

This PR:

• returns and tracks non-blocking prompt/shell dispatch promises;
• attaches a unique run token to active scheduler runs;
• immediately clears only the matching active run when its dispatch rejects;
• invalidates cached busy state, persists dispatch_failed, increments failure count, honors --max-failures, and reschedules normally;
• deliberately does not replay the prompt, avoiding duplicate turns when OpenCode status/events are delayed or multiple instances are involved;
• adds a deterministic delayed-rejection regression test;
• bumps the package to 0.5.23.

A temporary PR workflow applies the focused large-file patch and requires npm ci, syntax checks, the full test suite, Bun module loading, and npm pack --dry-run before committing the candidate.

[Copilot]

Pull request overview

This PR introduces a temporary automation path to apply and verify the v0.5.23 “dispatch recovery” patch (by rewriting src/index.js, updating tests, bumping versions, and updating docs) via a Python patch script plus a GitHub Actions workflow that commits the resulting candidate back to the PR branch.

Changes:

• Add scripts/apply-v0523.py to apply the v0.5.23 patch across src/index.js, tests, package metadata, changelog, and README.
• Add .github/workflows/apply-v0523-pr.yml to run the patch, run checks/tests, and commit/push the generated changes to the PR branch.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

File	Description
scripts/apply-v0523.py	Adds a one-shot patch application script that rewrites multiple project files to produce the v0.5.23 candidate changeset.
.github/workflows/apply-v0523-pr.yml	Adds a PR workflow intended to run the patch script, verify the result, and commit/push the updated candidate back to the branch.

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