feat(tui): add AI drafting flows

[aksOps]

Summary

• add abortable Draft with AI controls to the TUI card editor; generated fields remain in the form for review and manual save
• add a separate ADR split overlay with bounded paste/file input, configurable story count, editable review rows, destination selection, and per-row batch results
• call the shared internal/ai runner directly with ScopeReadOnly, operation/session guards, terminal-safe errors, and cancellation on every close path
• preserve TUI comments and link management (parity+) #91 detail action ownership and async completion routing

User impact

TUI users can draft a card or split an ADR without using the web UI. AI output never writes a card until the user reviews it and explicitly saves or adds the selected rows.

Validation

• go test -race ./... -count=1 (1,537 tests, 11 packages)
• GOFLAGS=-buildvcs=false sh scripts/check-go-coverage.sh (96.6% statements; required 96.4%)
• CGO_ENABLED=0 GOFLAGS=-buildvcs=false go vet ./...
• CGO_ENABLED=0 GOFLAGS=-buildvcs=false go build ./...
• npm test (695 tests; 98.26% statements)
• npm run build
• gofmt -l and git diff --check
• independent standards and spec/integration reviews: no remaining findings

GOFLAGS=-buildvcs=false works around the known linked-worktree VCS stamping failure in unmodified go list/build commands.

Closes #92

[sonarqubecloud]

Quality Gate passed

Issues
13 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.9% Coverage on New Code
3.0% Duplication on New Code

See analysis details on SonarQube Cloud