docs: project/Mission review cadence and external Human Gates

[pcvantol]

Coordinated architecture increment

GOVERNED_PROGRESSION_AND_DELIVERY_AUTHORITY_V1, with Forge #51 and EP #104; Forge Platform companion follows.

Designs policy/decision UX for project defaults and constrained Mission-specific review cadence, distinct from fixed pre-Mission approvals and target-owned pre-deployment gates. Prototype continuous-to-end and production after-Action review are supported target profiles. TST/ACC/PROD are bound to real targets, not authority-bearing labels.

Existing external CD retains its own gate: Workspace shows owner, waiting/decision status, exact evidence and trusted deep-link, not a duplicate Approve control. Explicit independent business and SRE gates remain separate. No credential-bearing proxy, arbitrary workflow editor, direct peer SQL or deployment authority.

Adds the local GP-WC/GP-W roadmap and canonical ROADMAP entrypoint; all implementation is PLANNED. Full UI/external-CD support is not a new first-canary prerequisite.

Scope and merge

Three Markdown files only. No application, schema, workflow, version, runtime, grant or deployment changes. Owner requested these architecture merges after qualification; actual hosted and documentary checks will be recorded. Other implementation/SemVer PRs are unchanged and not approved by this documentation.

[pcvantol]

Coordinated increment closure: all four documentation PRs are squash-merged and verified. Workspace merge: 86d31c362b9ba3823c64c44e8f0e52b8e9600065. Cross-repo merge/qualification record: pcvantol/forge#51 (comment) (Forge #51, EP #104, Workspace #16, Forge Platform #19). Workspace CI/TDE were green on final head d93c2691fec634ee99cd7e2b2d88b946f06f01b7. Architecture/roadmap is MERGED_CANONICAL; review settings and local/external gate UI remain PLANNED. No external approval, application implementation, workflow, grant or runtime changes.