docs(cardshed): add 2026-05-21 session handoff

[w7-mgfcode]

Summary

• Adds `@lab/ll-CARDSHED/HANDOFF.md` capturing the cardshed stack-bootstrap session (PR chore(cardshed): bootstrap @lab/ll-CARDSHED stack contract #145 merged at `cb780cc`) + the PRP 3 §A MVP umbrella decomposition (umbrella epic(cardshed): MVP — hot-seat browser (PRP 3 §A, M1–M17) #146, 8 sub-issues feat(cardshed): table render + privacy splash (M5+M6) #147–feat(cardshed): a11y + responsive + juice (M12+M13+M14) #154 chained M1→M17).
• Mirrors the `@lab/ll-RELIQUARY/HANDOFF.md` placement convention — stack-local, force-added past the root `.gitignore`'s `HANDOFF.md` rule (root `HANDOFF.md` / `.handoffs/` are intentionally local-only).

Refs #146.

Why this lives where it does

Root `HANDOFF.md` and `.handoffs/` are gitignored at `.gitignore:32` and `.gitignore:26` respectively — git log confirms no handoff has ever been committed at root. Stack-local placement matches the established reliquary precedent and survives full re-clones.

What the next session should do first

Next Step #1 in the handoff passes the actionable gate — it names the exact branch (`feat/cardshed-ui-scaffold`), the source PRP line (`PRPs/cardshed-03-experience-prp.md:716`), and the explicit `package.json` dep deltas (REMOVE pixi.js + react-router-dom; ADD partysocket, zod, immer, zustand, framer-motion, three @radix-ui/* packages, tailwind-merge, clsx, workspace link to @cardshed/core). References sub-issue #148.

Test plan

• CI passes (lint + markdown only)
• After merge: a fresh session reading `@lab/ll-CARDSHED/HANDOFF.md` can execute Next Step T1 — Working-tree triage & atomic baseline #1 without consulting other docs

Summary by Sourcery

Documentation:

• Document the cardshed stack bootstrap session, associated issues, and future work in a committed stack-local HANDOFF.md following the existing reliquary convention.

[sourcery-ai]

Reviewer's Guide

Adds a stack-local session handoff document for the cardshed stack, mirroring the existing reliquary convention and capturing the 2026-05-21 bootstrap session details plus next steps for PRP 3 MVP work.

File-Level Changes

Change	Details	Files
Introduce a committed stack-local handoff document for the cardshed stack.	Add @lab/ll-CARDSHED/HANDOFF.md containing a full narrative of the 2026-05-21 cardshed session, including what was done, decisions, dead ends, open questions, and next steps. Document the prior PR chore(cardshed): bootstrap @lab/ll-CARDSHED stack contract #145 merge details, the stack-contract bootstrap, and the decomposition of PRP 3 §A into an umbrella issue with sub-issues. Record operational gotchas (commit-format hook scopes, gitignore behavior, Stitch/agent-browser quirks) and provide a concrete, executable Next Step T1 — Working-tree triage & atomic baseline #1 for the next session.	@lab/ll-CARDSHED/HANDOFF.md

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e3ed9eca-8579-466b-b8d1-7508880ed76b

📥 Commits

Reviewing files that changed from the base of the PR and between cb780cc and bfdc596.

📒 Files selected for processing (1)

• @lab/ll-CARDSHED/HANDOFF.md

✨ Finishing Touches

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