boss: migration pilot — autonomous orchestrator mode generalised

First skill migrated from AILang's in-tree skills/. boss carries
the autonomous orchestrator authority (god-mode: dispatches every
other skill, decides done-state vs bounce-back), so it is the
load-bearing pilot for the migration pattern.

Profile schema gains three slots that boss needs:

- `git.issue_tracker.url`       — browsable issue list URL
- `git.issue_tracker.list_cmd`  — shell command listing open issues
- `notifications.command`       — script invoked on done-state /
  bounce-back; falls back to chat if empty

AILang-specific bits dropped from the prose:
- AILang/Gitea URL + tea CLI hardcoding → profile slots
- `design/contracts/0004-feature-acceptance.md` cross-reference
  → project CLAUDE.md (not the plugin's concern)
- "Boss" terminology → "orchestrator" (the plugin term; "Boss"
  was AILang vocabulary)
- "Brummel-as-LLM" → "the orchestrator"
- "milestone" → "cycle" (the profile's vocabulary slot)

Universal substance preserved verbatim: Iron Law, the five
process steps, the four bounce-back triggers + new-cycle
rationale, notification protocol, done-state editorial rules,
Common Rationalisations, Red Flags. No discipline-prose compression.

design/out-of-scope claim retracted: boss DOES generalise, and
its body now demonstrates how — the queue mechanic is a single
shell-command slot, not a transport-coupled contract.

skills/README.md flags boss as the landed pilot; the other seven
skills follow once the pattern is approved.

README.md

@@ -14,7 +14,7 @@ live in a small per-project profile file
 
 ## What's in the box
 
-Seven skills, each with the agents it primarily dispatches:
+Eight skills, each with the agents it primarily dispatches:
 
 | Skill | Trigger | Output | Mandatory? |
 |-------|---------|--------|------------|
@@ -25,6 +25,7 @@ Seven skills, each with the agents it primarily dispatches:
 | `debug` | Bug observed | RED test in working tree + cause analysis | Mandatory RED-first for any bug |
 | `fieldtest` | Orchestrator-dispatched post-audit, surface-touching cycle | example fixtures + friction spec | Optional |
 | `docwriter` | API surface stable across N cycles | rustdoc / docstring sweep | Optional |
+| `boss` | User types `/boss` | autonomous-orchestrator session — dispatches the other skills until done-state or bounce-back | User-invoked, never auto-dispatched |
 
 Vocabulary is configurable. AILang calls a cycle a *milestone*
 and a sub-cycle an *iteration*; your project may call them