Match the new template stub from dotclaude#5. Without this, a docs-only
PR on this repo (e.g. README polish) gets paths-ignored, the required
'review / Claude Review' check never reports, and the PR is permanently
BLOCKED. Already happened once on PR #1.

## Problem

The seed-mode design self-committed the seeded value back to the install
PR's branch via `GITHUB_TOKEN`. This hits a documented GitHub
limitation: **`GITHUB_TOKEN` pushes do NOT re-trigger pull_request
workflows**. The self-commit creates a new HEAD SHA with no check runs
reported on it — the PR is permanently \"blocked\" without manual `gh pr
close + reopen` and an empty user-attributed push.

Caught on the first real-world install (whois-api-llc/wxa-jake-ai#389) —
required close+reopen + an empty user push to unblock. Doesn't scale to
6+ remaining repos.

## New design

**Two-PR flow:**

1. **Install PR** ships `.coverage-floor` with `current=0` (seed marker)
+ caller workflow.
2. On `pull_request` with `current=0`: PASS. Post comment naming
proposed floor. **No self-commit.**
3. Install PR auto-merges naturally (one HEAD SHA, one check set).
4. After merge, `push:main` with `current=0` measures coverage and
**opens a follow-up PR** `chore(coverage): seed floor at X.X%` with the
seeded `.coverage-floor`.
5. Follow-up PR is 1-file-change, labeled `coverage-floor-seed`,
safe-paths-automerge eligible — auto-merges.
6. After follow-up merges, future PRs run in enforce mode.

## Properties

- No GITHUB_TOKEN re-trigger problem — each push gets its own workflow
run; seed PR is a normal PR with its own checks
- Two-PR flow keeps each PR minimal (workflow file + .coverage-floor in
#1; just .coverage-floor in #2)
- Loop-prevention guard preserved (refuse to seed below `seed_minimum`)
- Idempotent: skip if a `coverage-floor-seed` PR is already open
- Auto-creates the `coverage-floor-seed` label on first run

## Self-test (this repo)

ci-workflows itself stays in enforce mode — `.coverage-floor` here has
`current=99.0` against ~100% selftest coverage. The new seed path only
fires when `current==0`, so no behavior change on this PR's self-test.

## Companion changes (next PRs)

- dotclaude installer (`install-coverage-floor.sh`): docs update —
install PR is now passive, expect a follow-up seed PR.

## Auto-merge rationale

Workflow file change in ci-workflows — risk:blocked, manual click
required (same as #50–#54).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

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