AgentLoopKit v0.26.3

Patch release for task cleanup guidance.\n\nChanges:\n- Updated agentloop status and agentloop next to recommend agentloop task archive when the pinned active task is already done.\n- Added regression coverage for the done-active-task next-action behavior.\n- Updated README and status docs for the archive recommendation.\n\nVerification before release:\n- 33 Vitest files passed, 146 tests.\n- Typecheck passed.\n- Lint passed.\n- Build passed.\n- Markdown link check passed.\n- Release smoke passed.\n- npm publish --access public --dry-run passed.\n- projscan reported A, 97/100, with the known informational unused-export note for scripts/smoke-packed-release.mjs.\n\nTarball SHA-256:\n48bc379e41293cbcbc74facbf111548a307fb1bf3a179a0a08121cd2aa4c9c85