CAST v3.1.0

Individual tracking for user-found bugs, a one-off task backlog, and a planning stage that consumes both.

Added

• /file-bug intake skill (skills/file-bug/). Reviewer files the bugs found inside pipeline runs; until now a bug the user found had no route into the tracker short of starting a pipeline. /file-bug <description> files it the moment it is noticed: one instance of templates/BUG_REPORT.md at artifacts/one-off/bugs/bug-{XXX}-{slug}.md plus an artifacts/BUGS.md index row (Found during: user report — /file-bug, Status New, initial severity from the described impact — never guessing fields the user did not supply). Runs in-session, launches no agents, fixes nothing; Product remains the triage authority.
• /add-task intake skill (skills/add-task/). Queues small, self-contained work as TASK-XXX entries in the new artifacts/TASKS.md backlog without running anything. Screens scope at filing — clearly planning-tier work is routed to /agent-plan instead of queued; borderline entries carry a Notes flag for Pre-Flight to settle. Runs in-session, launches no agents.
• artifacts/TASKS.md — the one-off task backlog, new in the artifacts scaffold (installed by /cast-init alongside BUGS.md). Carries the canonical backlog lifecycle (Open → In Progress → Done, terminal Adopted → M{N} / Dropped) and field-ownership table, an index, and one entry block per queued task. Entries are queue entries, not task files — /agent-task instantiates templates/TASK.md when work starts.
• /agent-task backlog mode. /agent-task TASK-XXX runs one queued entry (its entry block is the task description); /agent-task backlog drains every Open entry sequentially through the full mini pipeline, flagging entries that fail the scope check (Open — needs planning) and continuing rather than halting. Invoked with no argument, /agent-task now offers backlog mode when Open entries exist. The orchestrator advances each queued entry's index row (Open → In Progress → Done, Resolution linking the task file).

Changed

• /agent-plan Stage 1 gains an intake sweep (new step 5, in the same Product launch as the Deferred re-triage): open user-filed bugs (artifacts/BUGS.md rows at New/Triaged) and open backlog entries (artifacts/TASKS.md rows at Open) are reviewed against the milestone being planned, and relevant items are adopted — a bug's fix becomes a task or lands in an existing task's criteria (bug triaged, index mirrored); a backlog entry becomes a milestone task with its row marked Adopted → M{N}. Items not adopted stay untouched: the sweep only adopts, it never closes or drops queue items. The Stage 1 input list now passes both queues; agents/product.md carries the matching duty.
• artifacts/BUGS.md documents /file-bug as the second filing route (user reports, filed under one-off/bugs/) in its lifecycle prose and field-ownership table; templates/BUG_REPORT.md adds the user report — /file-bug Found-during value.
• /cast-init installs the two new skills and the TASKS.md scaffold: roster pipeline-skills mapping, execution 5.5/5.7, dispositions, and validation checks 3/3a updated. The 5.5 install list also now names cast-release explicitly (it was installed but missing from that list).
• Payload READMEs, root README, TROUBLESHOOTING.md decision table, docs/FIRST_RUN.md smoke checks, and both CLAUDE.md files updated for the seven-skill roster and the new backlog file.