chore: prepare immutable v1.1.2 release

[bradtaylorsf]

Summary

• supersede the unpublished v1.1.1 installer baseline with immutable v1.1.2
• include the reviewed OpenAI-compatible/Ollama installer fix from fix: support generic OpenAI-compatible local model servers (Ollama) in the guided install #92/fix: support OpenAI-compatible local model servers without LM Studio management APIs #93
• update package, runtime, bootstrap, manifest, plugin, workflow, and documentation versions
• pin regenerated bootstrap and plugin checksums
• document the compatible local-server route and exact model-ID requirements

Verification

• pnpm install --frozen-lockfile
• focused release/model/docs tests: 22 passed
• pnpm verify: 582 passed, 1 intentionally skipped
• pnpm audit --prod --audit-level high: no known vulnerabilities
• local production container build: passed; OCI version label 1.1.2
• deterministic exact-commit candidate: all seven SHA256SUMS entries passed

Review

• no secrets, npm publication, mutable runtime tags, or enterprise-only capability changes
• v1.1.1 tag/release remains unchanged and unpublished
• release: publish and anonymously verify v1.1.2 installer assets #81 remains open until runtime and installer assets are publicly and anonymously verified

Related to #81
Closes #93