0.1.0 batch 2: add Runtime setup and stable Grain identity

[suraciii]

Goal

Make Runtime setup complete, explicit, and safe before the first Call.

Scope

• Make New start no background work.
• Require explicit State and Reminder Stores and add Check.
• Add Install, Register, Start, Shutdown, Stopping, and Done state rules.
• Generate stable GrainType values and reject duplicates at Start.
• Replace Binder with Grain Context without an alias.

Acceptance

• A failed Start accepts no Call and claims no Reminder.
• Old default GrainType rows remain readable.
• Setup and shutdown state transitions have deterministic tests.
• Generated fixtures, examples, and public docs use the new API.
• make ci passes.

References

design/release-0.1.0.md
design/runtime.md
design/codegen.md
design/persistence.md

[suraciii]

Batch 2 is complete in the local worktree.

Local commit: e9cd3c0
Branch: release-0.1-batch2-runtime

Independent review: PASS after two repair rounds.
Final verification: make ci passed with exit code 0. Focused race, sim, gen, and net tests passed. Five semantic mutations failed at their intended behavior assertions, and the restored implementation passed again.

The worktree is clean. This issue stays open because the local commit was not pushed and no pull request was opened.

[suraciii]

Completed in the integrated candidate #116: explicit Runtime setup, Stores and Check, lifecycle states, stable GrainType, duplicate rejection, and Grain Context are implemented with deterministic tests and updated generated examples. Exact master 0c41f9f644905183d7d4fd8f7efed24e4396bf0d passed local make ci and hosted run https://github.com/suraciii/gor/actions/runs/31504300130.