agent-task-management skill: make ask-is-not-NL warning prominent + add invocation contract

Agents repeatedly mistook `ask` for a natural-language interface and ran
things like `ask agent-task-management ...` or `ask <free text>`, forcing
orchestrators to paste the correction into every task description.

- Add a prominent STOP blockquote at the very top of SKILL.md stating that
  `ask` is a CLI with fixed subcommands and that agent-task-management is a
  skill name, never an `ask` subcommand.
- Add an explicit 'Invocation contract' section listing the only valid form
  (`ask <subcommand> [args]`) and the real subcommands, derived from existing
  content; consolidate the valid/invalid examples there (DRY) with inline
  reasons on the invalid ones.
- Mirror the same STOP warning at the top of references/00-context.md and
  tighten its rule to point at the contract.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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