B5.2: Add bounded split-output relay and source marks

[omry]

Relay separate stdout and stderr FIFOs through the existing ordered terminal writer. Public source marks identify exact logical byte ranges in the single raw output stream. Preserve interrupted output and resume each live reader after its complete admitted chunk is sent, including interruption at the final write boundary.

Validation: all 15 repository and native checks pass on the current candidate, including Go race coverage and genuine Linux amd64 Bash 5.2.15, 5.2.37 and 5.3.9. A focused scheduling overlay verifies completed-write interruption for both streams and both delivery paths; the original implementation fails all four cases. Those deterministic cases skip without the overlay. ARM64 was compiled only.

B5.3 owns production split start, resize and cleanup integration, including cleanup-before-keepalive closure, dual EOF, resource removal and final result barriers. This change supplies the isolated transport primitive.

---

• -> B5.2: Add bounded split-output relay and source marks #78
• B5.1: Own split FIFOs and pre-execute rollback #77
• B4.4: Integrate lifecycle and gate control dispatch #76
• Remove native validation executables after use #75
• B4.3: Add Awsh gate exchange and continuation boundaries #73
• B4.2: Add lifecycle decisions and controlled foreground SIGINT #72
• B4.1: Serialize PTY resize with finite output frontiers #71
• B3.4.2: Coordinate Envoy ordinary return and reusable shell handoff #70
• B3.4.1: Wire qualified Awsh private command and return exchange #69
• B3.3.2: Coordinate the original-epoch operation start transaction #68
• B3.3.1: Add owned PTY relay and held input boundaries #67
• B3.2.2: Launch qualified Awsh and commit public startup readiness #66
• B3.2.1: Add fixed Awsh private startup and idle shutdown #65
• B3.1.1: Add Envoy transport foundation with a fixed channel pair #64
• A2.13: Keep selected Envoy channels fixed and reject unused extras #63
• B2.8: Qualify native amd64 Bash builds and integrate admission #62
• B1.3.2: Correct corpus ownership and native qualification membership #61
• A2.12: Correct native qualification and controller-input ownership #60
• B2.1.1: Load qualification data from a manifest-bound payload #59
• A2.11: Separate qualification table identity from runtime binaries #58
• B1.3.1: Correct reserved trap query corpus expectation #57
• B2.7: Add ordinary completion and persistent Bash handoff #56
• B1.2.1: Preserve lexical paths in private inspection plans #55
• B2.6: Coordinate Bash start and PS0 release #54
• feat(awsh): B2.5 — Checked source and Readline submission #53
• fix(awsh): B2.3.3 — Echo-off readiness and exact terminal restoration #52
• docs(awsh): A2.10 — Echo-off Readline entry and exact terminal restoration #51
• feat(awsh): B2.4 — Readonly Bash state and whole-request mutation preflight #50
• feat(awsh): B2.3.2 — Startup readiness and partial-launch cleanup #49
• feat(awsh): B2.3.1 — One-exec handoff and selected-shell launch #48
• B2.2: Add Awsh helper transport and fail-stop mode #47
• B2.1: Add Bash build qualification and generated consumers #46
• B1.3: Static trace/case indexing and corpus completeness tooling #45
• B1.2: Add private and helper wire models and strict codecs #43
• B1.1: Add Envoy v1 public wire models and strict codecs #42

[gitar-bot]

Code Review ✅ Approved

🟡 Medium risk · Adding split stdout/stderr FIFO relay and source marks changes session output delivery; interruption or attribution errors could lose or mislabel command output.

Adds a bounded split-output relay that feeds separate stdout and stderr FIFOs through the existing ordered terminal writer, with public source marks identifying exact logical byte ranges in the raw output stream. No issues found.

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-18T10:43:35.120086Z	e988eab	Manual request
🔒 Security Review	✅ Completed 2026-10-18T10:38:19.817125Z	e988eab	Draft marked ready

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[omry]

@codex, regular review e988eab

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. You're on a roll.

Reviewed commit: e988eab87e

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