chore: scheduler run for decompose-agent

Decomposed src/lib.mjs into src/cmd-check.mjs, src/cmd-list.mjs, and src/cmd-complete.mjs to reduce file size.
Extracted logic preserves existing behavior.
Verified with lint and tests.
Reduced src/lib.mjs by 292 lines.

Co-authored-by: PR0M3TH3AN <[email protected]>

src/context/CONTEXT_2026-02-21T22-21-27Z.md

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+# Context: Decompose Agent Run 2026-02-21T22-21-27Z
+
+- Agent: decompose-agent
+- Cadence: daily
+- Session: 2026-02-21T22-21-27Z
+- Run-Start: 2026-02-21T22-21-27Z
+- Prompt: src/prompts/daily/decompose-agent.md
+
+## Goal
+Decompose `src/lib.mjs` into smaller modules to reduce size by at least 200 lines.
+
+## Scope
+Decomposition of `src/lib.mjs` by extracting command implementations.
+
+## Constraints
+- Do not change behavior.
+- Reduce size by at least 200 lines.
+- Preserve existing functionality.
+
+## Selection
+- File: `src/lib.mjs`
+- Original Size: 730 lines
+- Reason: Largest grandfathered file not recently refactored (based on manual check).
+- Commit SHA: a6c06ce173fbbff9170476e4b97c1bac4b30cb10
+- Node/npm: v22.22.0 / 11.7.0
+
+## Plan
+Extract cohesive blocks:
+1. `cmdCheck`
+2. `cmdList`
+3. `cmdComplete`