docs(archive): preserve PR #5126 discussion

docs/pr-discussions/PR-5126-rule-2-wake-time-substrate-lessons-from-session-2026-05-26-d.md

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+---
+pr_number: 5126
+title: "rule: 2 wake-time substrate lessons from session 2026-05-26 \u2014 dep-pin-search-first-authority + fighting-past-self recurrence anchor"
+author: "AceHack"
+state: "MERGED"
+created_at: "2026-05-26T07:58:07Z"
+merged_at: "2026-05-26T08:00:30Z"
+closed_at: "2026-05-26T08:00:30Z"
+head_ref: "otto-cli/substrate-landing-2-lessons-2026-05-26"
+base_ref: "main"
+archived_at: "2026-05-26T12:46:52Z"
+archive_tool: "tools/pr-preservation/archive-pr.ts"
+---
+
+# PR #5126: rule: 2 wake-time substrate lessons from session 2026-05-26 — dep-pin-search-first-authority + fighting-past-self recurrence anchor
+
+## PR description
+
+## Summary
+
+Per the maintainer 2026-05-26: *"should save some claude.md updates or something so you rmember"*. Wake-time-substrate landing for this session's two recurring failure-mode anchors.
+
+Both auto-load at cold-boot so future-Otto inherits them before next authoring decision.
+
+### Rule 1 (NEW) — `.claude/rules/dep-pin-search-first-authority.md`
+
+B-0805 sub-target 3 landing. Extends `.claude/rules/search-first-authority.md` (Otto-364) into dep-pin + substrate-path-assertion scope. WebSearch + cite source inline; training-data defaults never authoritative for version pins.
+
+Empirical anchors landed in rule body:
+- NixOS 24.11 pinned past EOL (B-0800)
+- Cascade #4 ISO audit asserted wrong NixOS layout (PR #5125 fix)
+
+### Rule 2 (UPDATED) — `.claude/rules/fighting-past-self-vs-peer-agent-distinguisher-...md`
+
+Recurrence anchor: this session the authoring agent CITED the rule as authorization for the exact failure mode the rule was supposed to prevent (silent-punt on 30 stale Otto-CLI PRs without discriminator pass). The maintainer's catch: *"this is the opposite of not fighting yourself this is losing to yourself no one take responsibliity"*.
+
+Key insight encoded: the rule is NOT authorization to skip work — it's authorization to ROUTE work to the right actor. Routing requires the discriminator pass.
+
+## Composition
+
+Both rules name the SAME root cause class — "Otto-defaults-to-plausible-but-unverified" — at different scopes (rule-citation vs version-pin). Cross-references added to both.
+
+## Test plan
+
+- [x] Both files added/updated
+- [x] Frontmatter / format matches existing `.claude/rules/` substrate
+- [x] Cross-references resolve
+- [x] Rule auto-loads at cold-boot (per wake-time-substrate)
+
+🤖 Generated with [Claude Code](https://claude.com/claude-code)
+
+## General comments
+
+### @chatgpt-codex-connector (2026-05-26T07:58:13Z)
+
+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).