feat(web): put the SDLC board behind a feature flag, off by default

[arielshad]

What

Adds an sdlcBoard feature flag, off by default, and puts the SDLC board behind it. While the flag is off:

• the sidebar hides the SDLC Board link;
• /sdlc returns 404;
• GET /api/sdlc-events returns 404;
• listSdlcBoard, reorderSdlcTask, updateSdlcTaskStatus and updateSdlcSubTaskStatus return an error without calling their use cases.

The flag is in the feature-flag catalog under Platform. It is listed on /settings/feature-flags with a switch, and shep settings flags enable sdlcBoard turns it on from the CLI. While it is on, everything works as before.

Unchanged: the Control Center canvas, the /features table, and the agent-side board tracker. The tracker keeps recording tasks, so turning the flag on shows a complete board. The board has no CLI command group, so there is no CLI gate to add.

Commit	Change
19edf55	The flag: TypeSpec (= false), defaults, migration 171 (feature_flag_sdlc_board INTEGER NOT NULL DEFAULT 0), mapper, repository SQL, web flag state, catalog entry, and labels in all 9 locales
777699b	One shared web feature gate in lib/feature-gate.ts (isFeatureOn, featureNotFound, FEATURE_OFF_ERROR). requireFeaturePage and the feedback/alerts routes now use it; intakeDisabled() is removed
6227dca	Gates the sidebar link, the page, the SSE route and the four actions
50e73f2	The /sdlc accessibility e2e case turns the flag on; FEATURES, domain-models and the LESSONS flag checklist are updated
05e4558	Migration renumbered from 170 to 171 (170 is the checkpoints workstream's)

Why

The owner decided the SDLC board should not be part of the default product surface. Implements specs/140-sdlc-board-flag/, building on the flag catalog and /settings/feature-flags from #925 (spec 135).

Screenshots / Recording

There is no new component. The flags view renders the new row from the catalog, like every other flag. The web e2e suite ran locally against the release build; it covers /settings/feature-flags, plus /sdlc with the flag on.

Testing

Local runs:

Check	Result
pnpm generate	no drift
pnpm lint, pnpm format:check, pnpm typecheck, pnpm tsp:compile	pass
pnpm test:unit	14,953 passed (on the merge with main at 1e1f859)
pnpm test:int	2,142 passed
pnpm check:stories	pass
pnpm build:release, pnpm build:storybook	pass
Web e2e with CI settings (flaky counts as failure)	86 of 86 passed

New tests, each landed RED first:

• tests/unit/presentation/web/app/sdlc-board-gating.test.ts covers the page, the SSE route and all four actions, with the flag off and on.
• tests/unit/presentation/web/lib/feature-gate.test.ts.
• A sidebar-links case for /sdlc.
• migration-171-sdlc-board-flag.test.ts, which checks the column, DEFAULT 0 and idempotency.
• A settings repository round-trip.
• The mapper both ways, the catalog group and the defaults.

Checklist

• pnpm lint passes
• pnpm format:check passes
• pnpm typecheck passes
• pnpm test:unit and pnpm test:int pass
• pnpm build succeeds
• pnpm build:storybook succeeds (no new components)
• pnpm tsp:compile ran and packages/core/src/domain/generated/output.ts is committed
• Tests landed RED-first
• No domain/ or application/ file imports anything from infrastructure/
• Conventional Commits; feat for the user-visible change
• LESSONS.md: the flag checklist now names the shared gate, and says that API routes and server actions need the gate too, not just the page

🤖 Generated with Claude Code

https://claude.ai/code/session_01TxtN2VcWzg6NTCLj4DbmfL

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