feat(base2): add meta-rule 'Syntax ≠ logic' to General guidelines

[chicagoist]

General principle: parser passes (node --check, tsc --noEmit, etc.)
do NOT mean the code works. Always verify execution, not just parsing.

Placed before the JavaScript Debugging rule (#872) as the axiom
from which the JS-specific verification steps follow.

Diff

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+- **Syntax ≠ logic:** `node --check`, `tsc --noEmit`, or any parser
+  pass does NOT mean the code works — always verify that code
+  executes, not just that it parses.
+- **JavaScript Debugging:** After fixing JS syntax errors, do NOT
+  stop at `node --check` passing — the code may be syntactically
+  valid but logically dead. Verify: (1) every `querySelector(All)`
+  target exists in the HTML body, (2) execution reaches every
+  `addEventListener` (trace from IIFE entry through all wrapping
+  `if` conditions), (3) no `if (elements.length > 0)` guard wraps
+  live logic around removed DOM elements.