docs(delivery): GitHub Issues as spec and queue — kind:state labels, issue forms, spec templates

[V3RON]

Summary

Makes GitHub Issues the spec and the queue for agentic delivery. First of three stacked PRs; this one is usable entirely by hand.

• docs/internal/agent-rules/delivery.md — the binding rule. Every issue carries exactly one <kind>:<state> label; agents act only on bug:triage, bug:ready, feature:ready, task:ready; the assignee is the claim; the body is the spec and comments are discussion; every spec session reconciles comments posted since the body's lastEditedAt; reporters' issues are never rewritten; feature specs describe outcomes, tasks carry business scope plus technical spec; triage produces a report, not a fix; done is defined per kind; ADR status follows the feature.
• Issue forms — a bug report (bug:new) and a feature request (request:new). Both reporter-facing and short. Blank issues stay enabled because feature and task specs are authored from templates, not forms.
• docs/internal/templates/feature.md, docs/internal/templates/task.md — the bodies a spec session writes. The task template carries the approval checkbox the automation in the third PR reads.
• .github/labels.json + labels.yml — the ten state labels declared in the repo and synced with gh label create --force on push to main. Create and update only; deletions are manual.
• docs/internal/DELIVERY.md — the maintainer's manual: the model in five sentences, the three walkthroughs (bug, single-PR feature, split feature), handoffs, what is automated, where ADRs fit.
• Rule 11, branches — work on issue <n> happens on <kind>/<n>, nothing appended; bug/<n>-repro for reproductions. Issue names branch, branch names issue.
• Rule 2, handoffs — an agent that stops before merge leaves one ## Handoff comment (Done, Not done, Findings, Blocked on) and unassigns. State, never spec; no progress logs.
• AGENTS.md, docs/internal/adr/README.md — link the rule; tie ADR status to feature state.

After merge (manual, once)

Relabel the open issues and retire the default labels. Proposed mapping, please correct before running:

Issue	Now	Becomes
#70	enhancement	feature:planned
#72 #74 #75 #76 #77 #78	enhancement	task:draft
#88	enhancement	feature:spec
#79	bug	bug:new
#52	none	bug:new

Then delete enhancement, bug, duplicate, invalid, question, wontfix, good first issue, help wanted. documentation, dependencies, github_actions stay because Dependabot uses them.

Stack

1. this PR — model, forms, templates, labels
2. skills: spec-session, triage-bug, deliver
3. issue-state.yml automation