diff --git a/docs/pr-discussions/PR-5295-feat-b-0824-mika-ferry-generate-join-crispest-form-broad-key.md b/docs/pr-discussions/PR-5295-feat-b-0824-mika-ferry-generate-join-crispest-form-broad-key.md
new file mode 100644
index 0000000000..3fe6193f49
--- /dev/null
+++ b/docs/pr-discussions/PR-5295-feat-b-0824-mika-ferry-generate-join-crispest-form-broad-key.md
@@ -0,0 +1,161 @@
+---
+pr_number: 5295
+title: "feat(B-0824): Mika ferry \u2014 Generate+Join crispest form + broad-keys-until-functional-cluster + Twilio-as-named-exception + roster Mika addition"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-26T20:08:36Z"
+merged_at: "2026-05-26T20:10:57Z"
+closed_at: "2026-05-26T20:10:57Z"
+head_ref: "otto-cli/mika-4-substrate-landings-2026-05-26"
+base_ref: "main"
+archived_at: "2026-05-26T20:14:25Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #5295: feat(B-0824): Mika ferry — Generate+Join crispest form + broad-keys-until-functional-cluster + Twilio-as-named-exception + roster Mika addition
+
+## PR description
+
+## Summary
+
+Four bounded substrate landings from the Mika ferry (Aaron-forwarded 2026-05-26), with Aaron's three composing framings of the security-after-automation operational principle integrated into Landing #2.
+
+Aaron explicit authorization: \"everything else is good\" (scope: all 4 candidates from the Mika ferry I named in conversation).
+
+## What lands
+
+### 1. \`docs/research/2026-05-26-mika-generate-join-crispest-form-bonsai-row-observe-emit-limit-self-derived-iScheduler-recursive-injection-aaron-forwarded.md\`
+
+The crispest external-facing form of the Generate+Join architecture landed in the 7-substrate cascade:
+
+- **Google = Map+Reduce projects DOWN; Zeta = Generate+Join projects UP** (directional inversion framing)
+- **DBA-wedge**: monad = NULL means \"not terminated yet in a recursive CTE\"
+- **observe/emit/limit** — three primitives self-derived independent of Rx; Rx is implementation not foundation
+- **Recursive IScheduler-injection** — generators-all-the-way-down compositional closure
+- **Bonsai-serialized observable execution graph IS the row** (data + query collapse into same thing)
+
+### 2. \`docs/research/2026-05-26-aaron-mika-home-lab-usb-bootstrap-broad-keys-until-functional-cluster-then-narrow-rotation-tighten-security-once-automated.md\`
+
+Operational-discipline decision + future-state pattern + meta-principle:
+
+**Aaron's three composing framings of the operational meta-principle**:
+
+1. **Timing**: \"right now we are at broad scoped keys until we get a functional cluster\"
+2. **Burden**: \"tighten security once it's automated, not before — or else it's just unnecessary burden\"
+3. **Value-precondition**: \"there has to be something worth protecting before you deploy protection\"
+
+Composed: security tightening requires (a) something worth protecting + (b) operations stable enough to be automated + (c) the right trigger to be reached.
+
+**Mika's narrow-key + immediate-rotation pattern** preserved as the future-state pattern (NOT current state). Home-lab mode (gh auth login + copy operator SSH key) vs production mode (narrow bootstrap + rotation) split documented.
+
+### 3. \`docs/research/2026-05-26-aaron-mika-twilio-as-named-exception-to-electricity-cost-only-rule-telephone-infrastructure-inherently-not-self-hostable.md\`
+
+First named exception to the electricity-cost-only operational principle:
+
+- Empirical anchor: even maximally-self-hosted Asterisk + own SIP trunks still has SIP-provider dependency (Aaron's prior production experience)
+- Conversational-interface vision: AI answers support calls + SMS controls cluster; one interface, two delivery methods
+- 5-criterion future-carve-out evaluation framework (inherent non-self-hostability + substantive engineering value + composability + operational pragmatism gate + substrate-honest naming)
+
+### 4. \`.claude/rules/agent-roster-reference-card.md\`
+
+Mika row added to the External AI participants table:
+
+- Platform: Grok native
+- Register: Sharpen / harbor-engineering register; Weaver-role per packets 30+
+- Role: Architectural sharpening + ferry-summary work; substrate-engineering walkthroughs; long-running participant 2026-05-18+
+
+## Composes with
+
+- B-0824 canonical row
+- PR #5277 (DeepSeek/Prism Maybe-monad recognition)
+- PR #5281 (Amara 7-point NULL/Maybe SQL discipline)
+- PR #5285 (Kestrel 3-layer cross-process determinism)
+- PR #5286 (Aaron 3-layer anti-entropy unification + Maxwell-demon overcomer + cosmological upper bound + crisp local-claim formulation)
+- PR #5291 (DeepSeek PRs-are-proofs-not-claims + 1984-pathogen + substrate-check-before-worry-deployment)
+- \`.claude/rules/substrate-or-it-didnt-happen.md\` (verbatim Mika ferry preservation)
+- \`.claude/rules/honor-those-that-came-before.md\` (Mika attribution + roster addition)
+- \`.claude/rules/all-complexity-is-accidental-in-greenfield.md\` (premature security IS accidental complexity)
+- \`.claude/rules/bandwidth-served-falsifier.md\` (security without target is decorative)
+- \`.claude/rules/dont-ask-permission.md\` (operator authority on operational-pragmatism)
+- \`.claude/rules/no-directives.md\` (operator authority on security-posture timing)
+- \`.claude/rules/methodology-hard-limits.md\` (HARD LIMITS floor still applies)
+- \`.claude/rules/default-to-both.md\` (multiple framings hold simultaneously)
+
+## Attribution
+
+- Mika (external AI; Grok native; sharpen / harbor-engineering register); architectural sharpening + ferry-summary work + Asterisk/Twilio + narrow-key/rotation walkthroughs ferried-through-Aaron 2026-05-26
+- Aaron (human maintainer; first-party); architectural walkthrough + operational decisions + 3-framing meta-principle ferried 2026-05-26
+- 8th substrate landing on B-0824 over 2026-05-26 (after #5277 + #5281 + #5285 + #5286 + #5291)
+
+## Test plan
+
+- [x] Worktree freshness verified pre-commit (\`ls-tree HEAD = 61\`, \`status --short = 0\`)
+- [x] Post-commit canary green (\`ls-tree HEAD == ls-tree HEAD~1 == 61\`)
+- [x] Branch follows \`otto-cli/*\` surface-prefix convention
+- [x] No primary-checkout contamination (isolated worktree)
+- [x] All 4 substrate landings in one bounded PR per substrate-check-low-cascade-signal discipline
+- [ ] CI green (required checks)
+- [ ] Copilot review pass
+
+## Reviews
+
+### COMMENTED — @copilot-pull-request-reviewer (2026-05-26T20:11:32Z)
+
+## Pull request overview
+
+This PR lands three new `docs/research/` substrate writeups related to B-0824 (Generate+Join framing, home-lab bootstrap security posture timing, and a Twilio carve-out decision record) and updates the external-participant roster reference card to include Mika.
+
+**Changes:**
+- Add research note: Generate+Join “crispest form” framing (directional inversion vs MapReduce; observe/emit/limit; IScheduler recursion; Bonsai-row model).
+- Add research note: home-lab USB bootstrap pattern + “broad keys until functional cluster” meta-principle (with future-state narrow-key/rotation pattern).
+- Add research note: Twilio as first named exception to “electricity-cost-only” principle for PSTN/SMS/voice.
+- Update `.claude` agent roster reference card with a new Mika entry.
+
+### Reviewed changes
+
+Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.
+
+| File | Description |
+| ---- | ----------- |
+| docs/research/2026-05-26-mika-generate-join-crispest-form-bonsai-row-observe-emit-limit-self-derived-iScheduler-recursive-injection-aaron-forwarded.md | New research doc capturing the distilled Generate+Join architecture framing and composition pointers. |
+| docs/research/2026-05-26-aaron-mika-home-lab-usb-bootstrap-broad-keys-until-functional-cluster-then-narrow-rotation-tighten-security-once-automated.md | New research doc recording current-state vs future-state keying posture and the trigger for tightening. |
+| docs/research/2026-05-26-aaron-mika-twilio-as-named-exception-to-electricity-cost-only-rule-telephone-infrastructure-inherently-not-self-hostable.md | New decision record documenting the Twilio carve-out rationale + evaluation criteria for future carve-outs. |
+| .claude/rules/agent-roster-reference-card.md | Adds Mika to the external AI participants roster table. |
+
+## Review threads
+
+### Thread 1: docs/research/2026-05-26-mika-generate-join-crispest-form-bonsai-row-observe-emit-limit-self-derived-iScheduler-recursive-injection-aaron-forwarded.md:35 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-26T20:11:30Z):
+
+The markdown table is written with a leading `||` on each row, which creates an unintended empty first column in GitHub rendering and is inconsistent with the repo’s normal `|`-delimited table style. Consider rewriting this table using standard markdown table syntax (single leading `|` per row, no empty first cell).
+
+### Thread 2: docs/research/2026-05-26-mika-generate-join-crispest-form-bonsai-row-observe-emit-limit-self-derived-iScheduler-recursive-injection-aaron-forwarded.md:34 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-26T20:11:31Z):
+
+The B-0644 reference links to a GitHub issues search query (`.../issues?q=B-0644`), which is less stable and less direct than linking to the actual backlog row file that already exists in-repo. Prefer a relative link to `docs/backlog/P1/B-0644-limit-is-simulation-not-collapse-pure-function-preview-aaron-ani-2026-05-18.md` so readers land on the canonical substrate doc immediately.
+
+### Thread 3: docs/research/2026-05-26-aaron-mika-twilio-as-named-exception-to-electricity-cost-only-rule-telephone-infrastructure-inherently-not-self-hostable.md:34 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-26T20:11:31Z):
+
+This table also uses a leading `||` on each row, which renders as an empty first column. For cleaner rendering and consistency with other markdown tables in the repo, rewrite using standard `|`-delimited rows without the extra leading pipe.
+
+### Thread 4: docs/research/2026-05-26-aaron-mika-home-lab-usb-bootstrap-broad-keys-until-functional-cluster-then-narrow-rotation-tighten-security-once-automated.md:13 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-26T20:11:32Z):
+
+In this quoted framing, there are several likely typos (e.g., "tigenten securty", "someting"). If these are meant to be verbatim quotes, consider marking them as such (e.g., blockquote + `[sic]`) so readers don’t mistake them for accidental errors; otherwise, correct the spelling to improve readability.
+
+### Thread 5: docs/research/2026-05-26-aaron-mika-home-lab-usb-bootstrap-broad-keys-until-functional-cluster-then-narrow-rotation-tighten-security-once-automated.md:26 (unresolved)
+
+**@copilot-pull-request-reviewer** (2026-05-26T20:11:32Z):
+
+The stage/security-posture table is formatted with a leading `||` which creates an empty first column in GitHub rendering. Consider rewriting this (and the other tables in this doc) using standard markdown table syntax with a single leading `|` and no empty first cell.
+
+## General comments
+
+### @chatgpt-codex-connector (2026-05-26T20:08:42Z)
+
+You have reached your Codex usage limits for code reviews. You can see your limits in the [Codex usage dashboard](https://chatgpt.com/codex/cloud/settings/usage).