Runs read the store; YAML retired (#109)

[CryptoJones]

Closes #109
Part of #105

What

load_config() reads the roster from the store and fetch_keys() decrypts secrets from it. --config names one store for both halves of a run and is forwarded to --each children as before. pass is now needed only for the DB key, one pass show per process.

• A .yaml/.yml --config dies with the import-yaml command that moves it in.
• PyYAML is imported only inside import-yaml. The run path and install.sh no longer need it.
• import-yaml --pull-secrets keeps its own sequential pass reader with the first-line rule.
• open_db() sets the busy timeout at connect, so journal_mode=WAL cannot race under --each -j N.
• DEFAULT_CONFIG is the store path, so skill/toolpanel.py runs unchanged.
• FlatlineRoundtable.yaml.example moves to tests/fixtures/legacy-example.yaml. It is the import-yaml fixture and still the annotated reference for every option. examples/full-roster.yaml becomes full-roster.json, and ci-config.yaml is replaced by ci-roster.json.
• Tests build stores with make_db(). New tests cover a store secret reaching the Authorization header end to end with no pass on PATH, a wrong DB key, a missing secret, and a refused YAML --config.
• CI installs cryptography only, reruns the suite with PyYAML on 3.14 for import-yaml, builds the --list store from ci-roster.json, and checks the YAML refusal and the single lazy import yaml.
• install.sh enforces Python 3.11+ and cryptography. README, CLAUDE.md, SKILL.md and .gitignore describe the store, the DB key, and that a store failure never fails a paid run.

Lane dicts do not yet carry lane_id/version, which the issue sketched. Nothing reads them yet; the consumers (#80 follow-ups, #89) can add them.

Manual gate (makemake, store imported in #123)

$ roundtable --list                       # 11 active lanes, from the store
$ roundtable --lanes SELMA --no-transcript --max-spend 0.02 "Reply with exactly the word OK..."
SELMA (nvidia/nemotron-3-super-120b-a12b:free) via Nvidia 0.7s
OK
1/1 lanes answered in 0.7s                # exit 0
$ roundtable --each -j 3 --lanes SELMA,Neuromancer,Proteus --no-transcript --max-spend 0.05 "..."
Neuromancer OK 1.6s / SELMA OK 0.4s / Proteus OK 5.8s, spend $0.0001   # exit 0
$ python3 skill/toolpanel.py SELMA brief.txt out.txt
# SELMA (nvidia/nemotron-3-super-120b-a12b:free, http) status=ok tool_calls=0 finish=stop   # exit 0
$ grep -c ".config/flatline-roundtable" roundtable
0

Verified

233 tests pass on Python 3.11 without PyYAML (9 import-yaml tests skip) and on 3.14 with it.

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Reviewing files that changed from the base of the PR and between f72028a and 0c5bbe6.

📒 Files selected for processing (13)

• .github/workflows/ci.yml
• .gitignore
• BACKLOG.md
• CLAUDE.md
• README.md
• examples/full-roster.json
• examples/full-roster.yaml
• install.sh
• roundtable
• skill/SKILL.md
• tests/fixtures/ci-config.yaml
• tests/fixtures/legacy-example.yaml
• tests/test_roundtable.py

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