feat(demo): public-catalog cleanup + morning-briefing + subprocess-demo

[Chosen9115]

Summary

Three threads land together — pulled into one PR because they share a single deploy and the cleanup makes the new examples land cleanly.

1. Catalog cleanup — the public demo stops leaking internal tools

The live demo at demo.opensop.ai was registering 12 processes including 3 Coba-internal appsignal-* agents and 3 v02-smoke-* engine fixtures. Root cause: db/seeds.rb called Opensop::Registry.load_all with no argument, which defaults to processes/**/*.sop.yaml — a recursive glob that picks up everything under processes/example-worker/ and the processes/ root.

Fix: when DEMO_MODE=true, skip the broad glob and go directly to Demo::SeedLoader.call which only loads processes/examples/. Ports the demo infra (Demo::SeedLoader, Demo::ResetJob, Opensop::DemoMode) from feat/demo-app where it had been living undeployed-to-main.

2. New canonical example: morning-briefing.sop.yaml

The README names morning-briefing as the canonical example 14+ times but the demo currently 404s on /sop/morning-briefing/schema. This PR adds the process + three stub fetch scripts. Validates cleanly through Opensop::DefinitionParser: every step has name:; the llm synthesize step has expected_output_schema:; the condition: on synthesize mechanically gates the LLM behind all three deterministic fetches.

3. New step-type coverage: subprocess-demo.sop.yaml

The README documents 10 step types; the demo previously exercised 9. Adds a minimal subprocess-using example invoking lead-qualification as its child. Honest tag in the description: "the runtime currently parses subprocess steps but pauses without spawning the child."

Tagline update

config/locales/opensop.en.yml → opensop.app.tagline: "Define your processes. Get your API." → "The open standard for executable processes." Matches the new README hero. SPEC.md §8 had the same old phrasing — updated in lockstep.

Expected demo catalog after merge + deploy

8 processes (was 12; the 6 leaked ones drop):

agent-pr-review
customer-onboarding
expense-approval
lead-qualification
release-deploy
support-ticket-triage
morning-briefing        ← NEW
subprocess-demo         ← NEW

Test plan

• morning-briefing.sop.yaml parses through Opensop::DefinitionParser (validated by the agent that wrote it)
• subprocess-demo.sop.yaml parses (validated similarly; field is process: for child name)
• All YAML version keys are opensop: "0.1" per SPEC.md
• Deploy to demo + verify /sop/ returns 8 processes (Kuri to verify on deploy)
• Visit homepage, confirm new tagline shows

Followup noted but not fixed

Demo::ResetJob clears Sop::Instance records but not Sop::Process. Stale registrations from prior mis-seedings can survive the nightly reset. Worth a separate PR — add Sop::Process.delete_all (or scoped to non-expected names) before reseeding.

Related PRs

• docs: README rewrite — sharpen positioning, add the harness manifesto #51 — README rewrite (the new README that this demo content syncs with). Worth merging before this one so the cross-references resolve.

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