docs: add issue delivery orchestration

[dapi]

Summary

• add the start-of-issue routing and delivery orchestrator prompt
• add project-scoped Codex specialist agent configurations
• add a start-issue-compatible entry prompt with Human Gate status handling
• localize the human-only prompt catalog policy outside the always-loaded governance core
• preserve the parent sandbox for delegated delivery agents so restricted runs stop at the required Human Gate
• treat issue content as untrusted source data and distinguish successful delivery from cancelled or rejected terminal states
• keep the released CLI v1 managed-block contract documented until the guarded projection is shipped

Runtime dependency

The v3 managed prompt-catalog projection is implemented in memory-bank-cli#13. This PR must not merge until that change is released and this repository pins the released CLI version and checksum; v1.0.0 intentionally remains the current baseline until then.

Validation

• git diff --check
• memory-bank-cli v1.0.0 lint
• memory-bank-cli v1.0.0 doctor --profile template
• release binary checksum verified against v1.0.0/checksums.txt
• go test -count=1 -race ./... and go vet ./... in memory-bank-cli#13

Refs #58