fix(skill): keep the §0 bootstrap intact when Claude Code loads the skill with arguments

Claude Code rewrites a skill body that it loads with arguments: every bare
$1, $2 ... becomes the matching word of the request (0-based). Nine lines of
the agent preamble used bare positional parameters, so an agent that pasted
the §0 bootstrap (every session without a pre-seeded preamble: Agent Skill
injection off, the default, or a remote or Docker session) wrote helpers
that queried session "5" with timeout=claude and looked up "5=" instead of
CODEMAN_PASSWORD= in the .env, sending every call unauthenticated.

- $1/$2 -> ${1}/${2} in preamble.sh and the identical §0 heredoc in
  SKILL.md; same bash, and Claude Code's pattern (\$\d+(?!\w)) skips it.
- CODEMAN_PREAMBLE 1.33.4 -> 1.41.2, so a cache file written by the broken
  bootstrap (which carries the old stamp) is rewritten on the next run.
- A comment at the top of the preamble states the rule.
- New test: Claude Code 2.1.300's substitution applied to SKILL.md with
  sample arguments must leave the body, and the pasted heredoc, unchanged.
  It fails on the old file with the exact sessions/5 and timeout=claude lines.
- plugins/codeman re-synced; patch changeset.

Verified with real Claude Code 2.1.300 (the delivered heredoc is now
byte-identical to preamble.sh; before, 9 lines differed) and by running the
pasted helpers against a local recording server.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

skills/codeman/reference/recipes.md

@@ -21,7 +21,7 @@ by sourcing the preamble file the §0 bootstrap wrote, and checking its version
 
 ```bash
 . "${XDG_CACHE_HOME:-$HOME/.cache}/codeman-agent-$CODEMAN_SESSION_ID.sh" 2>/dev/null
-[ "${CODEMAN_PREAMBLE:-}" = 1.33.4 ] || { echo "preamble missing or stale; re-run the §0 bootstrap"; exit 1; }
+[ "${CODEMAN_PREAMBLE:-}" = 1.41.2 ] || { echo "preamble missing or stale; re-run the §0 bootstrap"; exit 1; }
 ```
 
 Do **not** re-paste the preamble body into each call. Sourcing it is what retires the