docs(aidd-dev): drop stale reference to 05-ship precondition in SDLC rule

The branch-discipline rule mentioned a `05-ship` guarantee that does not
exist in the action file; trim the clause so the rule matches reality.

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

Author: blafourcade

plugins/aidd-dev/skills/00-sdlc/SKILL.md

@@ -70,7 +70,7 @@ Materialize the flow as a task list at skill entry; a task closes only when its
 - Skip allowed: `01-spec` only (when the source already carries objective + acceptance criteria). Never: plan, implement, review, ship.
 - Choose the best decision based on the facts.
 - Open a pull request once implementation is reviewed and complete.
-- **Branch discipline (caller responsibility).** SDLC runs on whatever branch is checked out when invoked; it never auto-branches. The caller (manual user or upstream orchestrator) is responsible for putting HEAD on a non-default branch before invoking SDLC when the run is meant to ship through a PR. `05-ship` enforces the final guarantee: if HEAD is on the default branch at ship time, it aborts with `contract_violation: on_default_branch` and refuses to commit or push.
+- **Branch discipline (caller responsibility).** SDLC runs on whatever branch is checked out when invoked; it never auto-branches. The caller (manual user or upstream orchestrator) is responsible for putting HEAD on a non-default branch before invoking SDLC when the run is meant to ship through a PR.
 
 ## References