chore: remove operator content-domain 'reel' language from the generic stack

[AlienWalker1995]

What

The public generic infra must not mention the operator's short-form-video "reel" content format. Every tracked reel/reels reference rewritten to neutral generic infra language. Behavior-identical: only comments, docs, tests, and identifiers change — no logic, paths, or config values. media (a structural compose profile + GPU-workload category) is left untouched.

reel → generic mapping, per file

File	Before	After
CHANGELOG.md	"a failed reel cron"	"a failed render cron"
docs/configuration.md	"the reel pipeline"	"the media/render pipeline"
docs/operator-guide.md	"a 17GB reel + a 4GB chat co-run"	"a 17GB render job + a 4GB chat co-run"
ordo.example.yaml	"media/song/reels/voice"	"media/song/voice" (dropped reels noun)
scripts/storage_purge.py	"Reel drafts", "(reel-metrics rewrites…)"	"Job drafts", "(metrics rewrites…)"
services/hermes/entrypoint.sh	"social-relay reel pipeline" (comment)	"render output pipeline" (chmod block preserved exactly)
services/ops-api/main.py	"the reel-cron failure", "was the reel-cron deadlock"	"the GPU-arbitration deadlock" (×2)
services/worker/plugin.yaml	"background job worker (reel/publish queue)"	"background job worker (job/publish queue)"
tests/substrate/test_broker.py	job ids/vars reel, reel1, reel2	render, render1, render2
tests/substrate/test_control.py	job id reel	render
tests/substrate/test_scheduler.py	job id reel	render

Test renames are consistent within each file — assertions test the generic scheduler/broker behavior, not content, and all still pass.

Validation

• git grep -inw "reel\|reels" -- ':!data/*' → zero matches.
• Rendered docker-compose.yml sha identical before vs after (a4a5409b…): changes are comments/docs/tests only, nothing structural.
• ruff check . clean; pytest tests/ -q → 559 passed, 4 skipped.
• media deliberately untouched everywhere (compose profile + GPU-workload kind).

Notes

• The hermes entrypoint chmod block is unchanged functionally — same dirs (/workspace/data/comfyui-output) and perms (775 / 664 / chown). The dir path is already generic (comfyui-output), not operator-specific, so only the comment wording changed.

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