chore: prepare 1.4.5 release

[tctinh]

Summary

Prepare the 1.4.5 patch release for the Copilot tool-guidance upgrade.

This release ships the generated Copilot guidance changes that make skill loading and tool usage task-triggered instead of ambient. It also refreshes every version-bearing release surface to 1.4.5, adds the dedicated release note, and updates the philosophy history for the patch.

Highlights

• teach Hive to load the right built-in skill for the current task (parallel-exploration, systematic-debugging, test-driven-development, verification-before-completion)
• add role-aware browser / Playwright / todo / memory guidance across the generated Scout, Forager, and Hygienic prompts
• make the built-in planning, execution, research, debugging, TDD, and verification skills explicitly tool-aware
• sync the committed .github/* artifacts with the updated generator contract
• prepare all 1.4.5 release surfaces: manifests, lockfiles, changelog, release note, and philosophy entry
• fix a Bun test-isolation bug in packages/vscode-hive where a partial hive-core module mock poisoned later tests

Release Notes

The GitHub Release body should come from docs/releases/v1.4.5.md.

Validation

• PATH="$HOME/.bun/bin:$PATH" node --test release-artifacts.test.mjs
• PATH="$HOME/.bun/bin:$PATH" bun test src/providers/sidebarProvider.test.ts src/tools/merge.test.ts
• PATH="$HOME/.bun/bin:$PATH" bun test in packages/vscode-hive
• PATH="$HOME/.bun/bin:$PATH" bun run release:check

Notes

• The release workflow publishes with repository secrets (NPM_KEY, VSCE_PAT) in GitHub Actions.
• Local workstation credential checks were not available through npm whoami / vsce verify-pat, so the CI rehearsal and tag-triggered workflow are the meaningful release-time gates here.