refactor: fold /setup_docs into /setup as third onboarding path (#9)

* refactor: fold /setup_docs into /setup as third onboarding path

- Auto-detect documents/ at /setup Step 0; offer three paths (documents
  folder, single CV import, interview).
- Inline document-driven merge logic into setup.md as Path A: read-before-
  write, additive vs. conflicting bucket merge with per-conflict prompts,
  inference labeling for behavioral and style files, STAR-stub generation
  instead of fabrication.
- Step 3 substeps for skill files skip when Path A populated them; non-
  skill substeps (CLAUDE.md, cv/main_example.tex, search-queries.md)
  always run. Path C interview preserved verbatim. /setup --section <name>
  update flow preserved.
- Delete .claude/commands/setup_docs.md.
- Update /reset prompts to point only at /setup. Update documents/README.md
  to reference /setup throughout. Update README.md to drop the standalone
  /setup_docs section and add upskill/ to the skills tree.
- Remove the trailing comma left in .claude/settings.local.json after the
  PR #6 revert (was technically invalid JSON).

Single onboarding entry point. documents/ folder convention unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(README): finish readme alignment for the /setup fold

- Update onboarding-paths tip to reflect three paths (was "Either"
  before /setup_docs landed in PR #6).
- Add documents/ and upskill/ entries to the file tree, both relied
  on by the new /setup Path A and by /upskill respectively.
- Add a brief "Other commands" section briefly describing /expand and
  /upskill so users discover them without having to read individual
  command files. /reset stays in the existing "Starting over"
  subsection, now linked from the new section.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/settings.local.json

@@ -5,7 +5,7 @@
       "Bash(python3:*)",
       "Bash(python:*)",
       "Bash(curl:*)",
-      "Bash(bun:*)",
+      "Bash(bun:*)"
     ]
   }
 }