Add release package automation and GitHub bots

[slashdevcorpse]

Summary

• Adds a repeatable package:codex-claw script that creates the npm-format release tarball under dist/release.
• Adds a tag/manual release workflow that validates, packages, writes SHA256 checksums, uploads workflow artifacts, and attaches assets to GitHub releases.
• Adds baseline CI for PR/main validation.
• Adds Dependabot coverage for npm workspaces and GitHub Actions.
• Adds CodeQL JavaScript/TypeScript scanning.

Release asset

• Uploaded codex-claw-0.1.0-alpha.0.tgz and SHA256SUMS.txt to the existing v0.1.0-alpha.0 prerelease.

Validation

• node -e "JSON.parse(require(''node:fs'').readFileSync(''package.json'',''utf8'')); JSON.parse(require(''node:fs'').readFileSync(''packages/codex-claw/package.json'',''utf8''));"
• git diff --check
• pnpm -C apps/codex-claw test
• pnpm -C apps/codex-claw build
• pnpm -C apps/landing build
• pnpm pack:codex-claw
• pnpm package:codex-claw
• pnpm audit --audit-level low

Closes #58

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Summary by cubic

Automates building and releasing the codex-claw package with a tag-based GitHub workflow. Adds baseline CI, Dependabot, and CodeQL to keep builds, security, and releases consistent.

• New Features
  • Added package:codex-claw script to produce an npm-format .tgz in dist/release.
  • Release workflow (tags or manual) validates, packages, writes SHA256 checksums, uploads artifacts, and attaches assets to GitHub releases.
  • Baseline CI on PRs and main: runs tests, builds, pnpm pack:codex-claw dry-run, and pnpm audit with low threshold.
  • Enabled Dependabot for npm workspaces and GitHub Actions, and CodeQL JS/TS analysis on PRs, pushes, and weekly schedule.

^{Written for commit 75be6ef. Summary will update on new commits.}

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