chore: remove Knative jobs runtime

[pyramation]

Summary

this removes the repo-local Knative jobs runtime AND the now-vestigial jobs config schema. Straight deletion — no behavior is reimplemented here.

1. Jobs runtime (commit 1)

• All 9 jobs/* packages (job-pg, job-utils, job-scheduler, job-worker, knative-job-fn, knative-job-server, knative-job-service, knative-job-worker, knative-job-example) + the - 'jobs/*' glob in pnpm-workspace.yaml.
• The cnc jobs CLI command (packages/cli/src/commands/jobs.ts), its entry in the command map, and its help text.
• @constructive-io/knative-job-service dependency from packages/cli.
• docker-compose.jobs.yml and the @constructive-io/knative-job-fn ambient module decl in types/external-modules.d.ts.
• jobs/knative-job-service from the pg-core CI test batch.
• Jobs workspace-group rows in CLAUDE.md / AGENTS.md.

2. Jobs config schema (commit 2)

Confirmed unused by constructive-db (it runs jobs with its own functions/ packages + config, and doesn't import @pgpmjs/types at all), so the config block was dead in this repo:

• Delete pgpm/types/src/jobs.ts (JobsConfig/jobsDefaults + the Job*Config/*JobParams types) and its export.
• Drop the jobs field/default from PgpmOptions (pgpm/types/src/pgpm.ts) and ConstructiveOptions (graphql/types/src/constructive.ts).
• Remove the JOBS_* / INTERNAL_GATEWAY_URL / INTERNAL_JOBS_CALLBACK_* env parsing and the jobs.gateway.* production-safety asserts from pgpm/env.
• Drop the jobs cases from the env merge/assert tests and re-record the pgpm/env + graphql/env merge snapshots (the "jobs": {…} block is gone).

Deliberately kept (per @pyramation — schema-modeling, not runtime)

• JobTrigger blueprint node and everything under packages/node-type-registry (it declares triggers that call app_jobs.add_job(); it does not run jobs).

Verification

• pnpm install (workspace 113→104 projects), pnpm build:dev — green.
• pgpm/env (26) + graphql/env (9) + packages/cli tests pass; snapshots re-recorded.
• No remaining references to the removed packages/command/config symbols (grep-confirmed; the only JOBS_SCHEMA hits left are generic sample keys in packages/12factor-env's own parser tests, unrelated to jobs).

Follow-up

Removal recorded on planning issue #1252 (commit SHA 783fda96) so constructive-db parity can be diffed against this revision. Also flagged there: constructive-db's functions/job-worker currently imports the published @constructive-io/job-utils (published from this repo) — it needs its own jobs/job-utils package rather than depending on constructive's published one.

Link to Devin session: https://app.devin.ai/sessions/7f3cb2f4bf1147d6a97b30fd9aa56236

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