skeleton: plugin layout + docs, skill/agent migration deferred to iter 1

Establishes the repository structure for the skills plugin:
- README + INSTALL describing the two-layer split (plugin
  mechanics vs per-project profile)
- docs/design, profile-schema, pipeline, agent-template covering
  the universal discipline constants and the profile slot model
- templates/project-profile.yml as a copy-and-fill starting point
- templates/CLAUDE.md.fragment with the baseline orchestrator
  rules a project can import
- install.sh / uninstall.sh wiring skills/ + agents/ into
  ~/.claude/ via idempotent symlinks
- skills/ and agents/ directories empty except for migration
  READMEs; the actual SKILL bodies and agent files migrate
  from ~/dev/ailang/skills/ in the next iteration.

No skill or agent runs yet — this commit only stands up the
structure and documents the substitution model.
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# Agent template
Every agent file follows the same structure. Deviations need a
named reason in the agent's own body. The template was distilled
from the AILang in-tree agents and refined to remove project-
specific identifiers.
## File layout
```
---
name: <agent-slug>
description: <third-person, "Use when…" or role description>
tools: <comma-separated tool list>
---
> Violating the letter of these rules is violating the spirit.
## What this role is for
<one short paragraph naming the failure mode the agent exists
to prevent>
## Standing reading list
<list of always-binding documents — derived from the project
profile's `standing_reading.always` plus `standing_reading.by_role.<this-role>`>
## Carrier contract
<what the dispatching skill hands the agent: task_text, diff,
hypothesis, etc. Agents do NOT open the project's plan or spec
directories directly — context curation lives at the skill level>
## Iron Law
<the non-negotiable rules of this role, as a numbered list>
## The Process
<numbered steps>
## Status protocol
<which terminal states this agent uses, and what evidence each
state requires>
## Output format
<word-budgeted, structured>
## Common Rationalisations
| Excuse | Reality |
|--------|---------|
| … | … |
(Calibrated to the past failure modes of this role.)
## Red Flags — STOP
- If you're about to do <X>, stop.
- …
```
## Frontmatter conventions
### `name`
The agent slug, lowercase kebab-case. No project prefix (the
old `ailang-*` prefix was an AILang-only convention; the
plugin's agent path is enough disambiguator).
Examples: `architect`, `bencher`, `debugger`, `implementer`,
`tester`, `fieldtester`, `docwriter`, `grounding-check`,
`plan-recon`, `spec-reviewer`, `quality-reviewer`,
`implement-orchestrator`.
### `description`
One sentence. Third-person. Either "Use when…" or a role
description. This is what the orchestrator (or a skill) reads
to decide whether to dispatch the agent — keep it sharp.
### `tools`
Comma-separated list of Claude Code tool names. No agent
receives `Agent` in its tools (no nested subagent dispatch).
The dispatching skill composes; agents do not call other
agents.
Common tool sets:
- Read-only review (architect, spec-reviewer, quality-reviewer,
grounding-check, plan-recon): `Read, Glob, Grep, Bash`
- Implementation (implementer, tester, debugger, docwriter,
fieldtester, bencher): `Read, Edit, Write, Bash, Glob, Grep`
- Orchestrator (implement-orchestrator): `Read, Edit, Write,
Bash, Glob, Grep` — same as implementer; the orchestration
happens via sequential role-switches within its own context
## Sections in detail
### Spirit-letter lead-in
The single line `> Violating the letter of these rules is
violating the spirit.` is mandatory at the top. It exists to
forestall the "well, technically I didn't break the rule" class
of rationalisation.
### What this role is for
One short paragraph. Names the failure mode the agent exists to
prevent — not the success mode it enables. Failure-mode framing
is sharper for the model: "this role exists because past attempts
to do X without a dedicated reviewer led to Y" reads more
forcefully than "this role helps with X".
### Standing reading list
The plugin's skill body computes this from the project profile
(`standing_reading.always` + `standing_reading.by_role.<role>`)
and passes the resolved list to the agent via the carrier. The
agent's body says, prosaically: "Read everything in the standing
reading list before doing anything else."
The agent file itself does not hardcode file paths.
### Carrier contract
The carrier is the small payload the skill hands the agent. It
typically includes:
- `task_text` — the spec excerpt or plan task verbatim
- `diff` — for reviewers, the diff to review
- `hypothesis` — for the bencher, what it should test
- `bug_symptom` — for the debugger, the observable misbehaviour
- `drift_focus` — for the architect, what part of the ledger to
check
Agents do **not** open the project's plan or spec directories
directly to fish for context. Context curation lives at the
skill level so the orchestrator can see exactly what each agent
was told.
### Iron Law
Numbered list of the non-negotiable rules. These are the rules
the agent will violate if it rationalises. Calibrate to past
failure modes — abstract rules don't land; rules anchored to a
named past mistake do.
### The Process
Numbered steps. Each step is concrete — "Read X", "Run Y",
"Write to Z" — not abstract phases like "explore" or "synthesise".
### Status protocol
Specifies which terminal states the agent uses (see
`pipeline.md`) and what evidence each state requires. For
example: `DONE` requires "build green AND tests green AND no
new warnings".
### Output format
Word-budgeted. Structured — usually a small set of named
sections the orchestrator can quote in its commit body. The
budget prevents agent reports from drowning the orchestrator's
context.
### Common Rationalisations
A table of excuse → reality. Calibrated to the past failure modes
of this role. The point is to short-circuit the rationalisation
before it derails the agent's process.
### Red Flags — STOP
Bullet list of "if you're about to do this, stop" signals.
Concrete, not abstract. "If you're about to write a fix without
a failing test, stop" beats "be disciplined".