Migrate spells to Ops

[lex00]

Part of the Op / Temporal deployment workflow redesign.

Removes the old spells system entirely. The 11 mechanical spells (2-task deploy + snapshot) are dropped — users run npm run deploy directly from example directories. The 5 substantive spells are rewritten as *.op.ts files.

Tasks

• Delete the 11 mechanical spells (lambda-*, gcp-*)
• Rewrite alb-infra, alb-api, alb-ui as ops/alb-deploy.op.ts (single Op with sequential phases)
• Rewrite gke-bootstrap as ops/gke-bootstrap.op.ts
• Rewrite any remaining substantive spells as *.op.ts files
• Delete spells/ directory
• Update repo README and docs to remove spell references
• Update example READMEs that referenced chant spell cast