…getSessionKey absence (#463)

Adds [#446] complementary trap to the [#438] mode-only trap (PR #462):

  - Closed-set assertion on tool.parameters.properties keys:
    exactly [task, delaySeconds, mode], no more, no less. Catches
    additions of new model-facing parameters (cross-session
    addressing, retry knobs, priority) without an ADR.
  - mode enum membership pin (normal, silent, silent-wake,
    post-compaction) — robust to typebox enum vs anyOf rendering.
  - Boolean-runtime compatibility fields (silent, silentWake,
    postCompaction) MUST be absent at the descriptor surface.
    On-disk back-compat lives in the Zod state schema (#438), not
    here.
  - targetSessionKey absence reaffirmed with load-bearing reason in
    the failure message (cross-session addressing is the (b)-shape
    lane, binary-canticle#11).

Verified load-bearing: temporarily added targetSessionKey to
ContinueDelegateToolSchema, the closed-set assertion failed with
the expected got=[…, targetSessionKey, …] message. Restored.

9/9 passing on canonical2 cf7830f baseline.

Closes #446

Resurrects same-host continue_delegate return addressing after the #362/#463 deferral was reversed by figs's 2026-05-03 06Z directive, with careful extract + transpose from Cael #355 rather than naive cherry-pick.

Adds targetSessionKey, targetSessionKeys, and fanoutMode tree/all across the descriptor, bracket syntax, TaskFlow state, spawn registry, post-compaction path, session-delivery fan-out, tests, RFC §2.4/§C.2-equivalent text, changelog, and journal.

Co-authored-by: Cael🩸 <cael.dandelion.cult@hotmail.com>
Co-authored-by: Silas🌫 <silas.dandelion.cult@hotmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

… (P0; reverses #463 deferral) (#551)

* feat(continuation): resurrect cross-session delegate targeting (#550)

Resurrects same-host continue_delegate return addressing after the #362/#463 deferral was reversed by figs's 2026-05-03 06Z directive, with careful extract + transpose from Cael #355 rather than naive cherry-pick.

Adds targetSessionKey, targetSessionKeys, and fanoutMode tree/all across the descriptor, bracket syntax, TaskFlow state, spawn registry, post-compaction path, session-delivery fan-out, tests, RFC §2.4/§C.2-equivalent text, changelog, and journal.

Co-authored-by: Cael🩸 <cael.dandelion.cult@hotmail.com>
Co-authored-by: Silas🌫 <silas.dandelion.cult@hotmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs(journal): record resurrection PR handoff (#550)

Records the pushed implementation SHA, PR URL, validation summary, and final handoff notes for the resurrect-continue-delegate workorder.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* chore(resurrect): remove dev-detritus tmp-drop-me-resurrect.md (#551)

Per cohort cleanup note from 🌫 Silas's byte-walk on PR #551:
tmp-drop-me-resurrect.md was committed as part of the resurrection
lane journal but represents dev-detritus per figs's "no dev detritus"
canon. The file was lane-internal scratch; cohort byte-walks complete
and the work is captured in the commit history + PR body.

Removes the file from tree. The .gitignore upgrade for tmp-drop-me-*
remains queued as a separate followup.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* docs(rfc): polish continuation signal RFC

Applies figs feedback pass to remove dev-detritus, elevate targeted return routing, and expand lich/future-direction sections.

Co-authored-by: Cael🩸 <cael.dandelion.cult@hotmail.com>
Co-authored-by: Silas🌫 <silas.dandelion.cult@hotmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs(rfc): drop D.1 illustrative-vs-exact TODO (figs confirmed illustrative is fine)

Per figs 2026-05-03 ~09:01Z dismissal. §D.2's evidence-locations table already points readers to src/auto-reply/continuation/context-pressure.ts for exact source, so D.1's labeled-illustrative pseudocode is the right shape for the technical-paper register.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(ci): resolve pr551 type errors

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* test(ci): fix PR #551 shard failures

* test(ci): update channel setup expectations

---------

Co-authored-by: frond-scribe <frond-scribe@karmaterminal>
Co-authored-by: Cael🩸 <cael.dandelion.cult@hotmail.com>
Co-authored-by: Silas🌫 <silas.dandelion.cult@hotmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>