refactor(projects): remove misleading Hub lifecycle status filter (#2274 B-6)

[DeliciousBuding]

Semantics (Option A — hard evidence)

Hub Project is a workspace/container; there is NO server-authoritative project lifecycle/status/archive transition. Verified: OpenAPI WorkspaceProject (required=[id,name,owner_id,created_at,updated_at]; properties id/name/description/owner_id/created_at/updated_at) has no status field; DB workspaces table is 6 columns; GET /web/projects accepts only q/pageCursor/pageSize; create/patch bodies only name/description. #2316 (B-6 hygiene) already removed the structurally-unreachable status:Active orphan mapper, fixed the stale comments, and aligned openapi enums; it explicitly DEFFERED the product-visible filter-chips to the operator (ADR-034 convergence path). This PR takes that deferred decision: no server lifecycle → the UI must not present lifecycle filters.

Change

Remove the misleading Project lifecycle filter (Running/Completed/Archived chips) from the Workbench Projects left nav — the whole chip bar (incl All projects which only belonged to it). Delete the only-for-this-filter state: projectFilter/availableProjectFilters/filterProjectsByStatus/resolveAvailableProjectFilters/projectStatusBucket/ProjectStatusBucket/PROJECT_STATUS_BUCKETS/FILTER_ITEMS and the nav props/types/export/CSS. visibleProjects now derives straight from sourceProjects (no new predicate). Search, project rows, selection, and loading/error notices are kept; selection/active-fallback behavior unchanged.

Not changed

• Task status filter, ProjectRun status, web queue status, AgentTeam status — untouched.
• ProjectInfo.status is NOT renamed/refactored (still the display label; row/head badge still shows it).
• No backend schema/API/state machine introduced.

Verification

• focused workbench tests: ProjectNav 1/1, useWorkbenchProjectsRoute 4/4, workbenchRoutesHelpers 9/9, ProjectsPage 11/11 → 25/25.
• @agenthub/workbench typecheck PASS.
• canonical coverage baseline @agenthub/workbench: EXIT=0, uncovered 5 (=baseline), zero skipped, no regression.
• git diff --check PASS.
• Net 14 files changed (+8/-424 tracked) plus new ProjectNav.test.tsx; 2 obsolete filter tests removed.

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