docs: simplify cj-comments skill + add VERIFY placement/completion rules

Rounds of simplification on the cj-comments skill: converged on
source-block-only in org files, dropped the non-org parsing entirely,
factored out the mechanical parts into helper scripts (added separately
in another repo), and codified the VERIFY placement + completion rules
in a canonical rule file so the conventions stop being implicit.

Skill (.claude/commands/respond-to-cj-comments.md):

- Drop the file-type comment-marker table and the non-org multi-line
  continuation rule. The skill now recognizes only the org source-block
  form (#+begin_src cj: ... #+end_src). Craig's yasnippet keeps typing
  cost flat.
- Defensive parsing for legacy inline cj annotations in older org files
  (back-compat).
- Prefer the new helper scripts: step 1 calls cj-scan for structured
  detection; step 4 sub-step 6 calls cj-remove-block for validated
  removal. Both have explicit fallback paths to grep+Read / Edit.
- Completion rules now split by keyword: TODO/DOING at *,** stay
  task-shaped (DONE + CLOSED); deeper TODO/DOING flip to dated headings;
  VERIFY at any depth flips to a dated heading with body replacement.
- New VERIFY-answer pattern: when a cj's parent_heading_chain ends with
  VERIFY, the cj is the answer to that VERIFY. Lift its body into the
  dated rewrite (or execute the instruction first if indirect), then
  delete the cj.
- New placement rule for new VERIFYs: sibling of the trigger heading,
  not a child. Climb to *** when the trigger is buried at ****+. This
  is the active force that keeps todo.org flat.
- Rename "cj: comment" to "cj comment" in prose; preserve the literal
  cj: token in code examples and grep targets.

Canonical rule (claude-rules/todo-format.md):

- New "VERIFY tasks" section with four subsections: Placement (** or
  *** only), Creating a new VERIFY (sibling of trigger), Completion
  (dated rewrite + body replacement at any depth), Don't leave stale
  placeholders.
- Worked before/after examples for both top-level and first-level
  VERIFYs.

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