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+---
+name: fahrenheit-451
+description: Perform a zero-based documentation purge and consolidation pass over markdown and other plaintext note files. Use when Codex needs to inspect every doc-like file in a subtree, presume each file should be deleted, classify each file into a hard disposition, reconcile kept docs against code, and flag unresolved contradictions instead of guessing at supersession.
+---
+
+# Fahrenheit 451
+
+Use this skill for markdown and plaintext notes. It is not language-specific, but it is still codebase-aware: any kept documentation must be reconciled against the code.
+
+## Contract
+
+- Require a concrete subtree.
+- Default plaintext scope to `*.md`, `*.txt`, `*.rst`, `*.adoc`, and `*.org`, plus obvious repo-local note files.
+- Presume every file should be deleted.
+- If a file survives deletion, presume it should be rewritten from scratch in condensed form unless there is clear justification for `light_edit` or `keep_as_is`.
+- Inspect every file in scope. No sampling.
+- Create one persistent `/tmp` worklog before the first file read. Chat is summary only; the worklog is the durable source of truth.
+- Partition the manifest into intentional logical cliques before deep reading.
+- Read at most 8 files per wave.
+- Write a `/tmp` checkpoint after every wave before reading more files.
+- Give every file exactly one final disposition.
+- Reconcile every kept or spec-like file against the code.
+- When a document contradicts code and precedence is unclear, do not guess. Record it in the contradiction register.
+
+Git history is the archive. Do not preserve dead docs by moving them into a graveyard folder.
+
+## File Dispositions
+
+Every file must end in exactly one of these:
+
+- `delete`
+- `merge_then_delete`
+- `rewrite_from_scratch`
+- `light_edit`
+- `keep_as_is`
+- `flag_contradiction`
+
+Use `keep_as_is` rarely. Use `light_edit` only when the file is basically correct and materially worth preserving. Use `rewrite_from_scratch` as the default survival mode.
+
+## Flow
+
+### 0. Create the worklog
+
+Create a path shaped like:
+
+```text
+/tmp/fahrenheit-451-<repo-or-dir>-<subtree-slug>.md
+```
+
+Use [references/tmp-worklog-template.md](/home/main/projects/skills/fahrenheit-451/references/tmp-worklog-template.md).
+
+The worklog must hold:
+
+- the manifest
+- the clique plan
+- every wave checkpoint
+- the file decision ledger
+- the contradiction register
+- the residual summary
+
+If interrupted or resumed, reopen the same worklog before continuing.
+
+### 1. Lock scope and manifest
+
+Enumerate every plaintext file in scope and write the manifest into the worklog immediately.
+
+Use fast file discovery, for example:
+
+```bash
+rg --files <subtree> -g '*.md' -g '*.txt' -g '*.rst' -g '*.adoc' -g '*.org'
+```
+
+Use [references/file-manifest-template.md](/home/main/projects/skills/fahrenheit-451/references/file-manifest-template.md).
+
+### 2. Plan logical cliques
+
+Group manifest files into small logical cliques before deep reading.
+
+Use [references/read-cluster-template.md](/home/main/projects/skills/fahrenheit-451/references/read-cluster-template.md).
+
+Good clique causes:
+
+- same topic or subsystem
+- same audience
+- same lifecycle stage such as planning, reference, runbook, migration note, or historical residue
+- likely supersession relationship
+- duplicate content clusters
+- same code surface or command surface
+
+Cliques may overlap. A file may appear in multiple cliques. Keep cliques to 2-8 files.
+
+### 3. Run bounded coverage waves
+
+For each clique wave:
+
+- read at most 8 files
+- decide what the clique is trying to resolve: duplication, supersession, condensation, contradiction, or audience split
+- update the manifest coverage
+- write a `/tmp` checkpoint containing:
+  - clique id and purpose
+  - files inspected in the wave
+  - deletion candidates
+  - merger candidates
+  - files that look keep-worthy
+  - likely rereads in later cliques
+  - likely code surfaces to reconcile
+
+Do not read a 9th file until that checkpoint exists.
+
+### 4. Make first-pass file decisions
+
+After every file has been inspected at least once, assign each file a provisional disposition.
+
+Use [references/file-decision-ledger-template.md](/home/main/projects/skills/fahrenheit-451/references/file-decision-ledger-template.md).
+
+For every file, record:
+
+- path
+- apparent doc kind
+- intended audience
+- provisional disposition
+- short keep-or-delete basis
+- superseded_by_or_merge_target if applicable
+- rewrite_needed
+- code_reconciliation_target
+
+The keep burden is intentionally light but real. A short justification is enough if it is concrete.
+
+### 5. Reconcile surviving docs against code
+
+For every file with provisional disposition `rewrite_from_scratch`, `light_edit`, `keep_as_is`, or `flag_contradiction`, reconcile it against the code, tests, commands, config, or generated behavior it claims to describe.
+
+Ask:
+
+- does the code still do what this file says?
+- is this file obviously stale?
+- is this a stable formal definition, ADR, public contract, runbook, or reference that still earns its keep?
+- does another doc supersede it?
+- if there is a contradiction, is precedence obvious?
+
+If precedence is not obvious, move the file to `flag_contradiction` and record the issue in [references/contradiction-register-template.md](/home/main/projects/skills/fahrenheit-451/references/contradiction-register-template.md).
+
+### 6. Execute the purge and consolidation
+
+Apply the final dispositions.
+
+Meaning of the dispositions:
+
+- `delete`: remove the file outright
+- `merge_then_delete`: fold the scarce useful material into the target file, then delete the source
+- `rewrite_from_scratch`: keep the file path or merge target, but rewrite the content in condensed form
+- `light_edit`: keep the file and patch it narrowly
+- `keep_as_is`: keep untouched with a concrete justification
+- `flag_contradiction`: keep or quarantine only as needed while reporting the unresolved conflict
+
+Default victims:
+
+- roadmaps
+- done feature docs
+- stale checklists
+- obsolete migration notes
+- narrative implementation notes whose only job is to duplicate the code
+
+Default survivors:
+
+- durable formal specs
+- crisp reference docs
+- active operator runbooks
+- ADR-like decision records
+- public-facing contracts that still match reality
+
+### 7. Verify the resulting doc set
+
+After edits and deletions:
+
+- re-scan the same manifest scope
+- confirm every original file received a disposition
+- confirm every surviving spec-like file was reconciled against code
+- update the contradiction register and residual summary in the worklog
+
+## Final Response
+
+Always include:
+
+- the `/tmp` worklog path
+- manifest coverage summary
+- clique-wave summary
+- file disposition counts
+- contradiction register summary
+
+If you edited docs, also include:
+
+- deleted files
+- merge targets
+- rewritten files
+- lightly edited files
+- untouched keepers with justification
+
+## Hard Failure Modes
+
+- do not inspect only “important” docs
+- do not keep checkpoint state only in chat
+- do not read more than 8 files without a persisted checkpoint
+- do not keep a file because deleting it feels scary
+- do not leave a file in a vague “maybe keep” limbo
+- do not keep roadmap, checklist, or done-feature residue by inertia
+- do not preserve stale docs by moving them into archive folders
+- do not keep a spec-like file without reconciling it against code
+- do not resolve genuine code-vs-doc contradictions by guessing at supersession
+
+## Resources
+
+- [references/file-manifest-template.md](/home/main/projects/skills/fahrenheit-451/references/file-manifest-template.md)
+- [references/read-cluster-template.md](/home/main/projects/skills/fahrenheit-451/references/read-cluster-template.md)
+- [references/file-decision-ledger-template.md](/home/main/projects/skills/fahrenheit-451/references/file-decision-ledger-template.md)
+- [references/contradiction-register-template.md](/home/main/projects/skills/fahrenheit-451/references/contradiction-register-template.md)
+- [references/tmp-worklog-template.md](/home/main/projects/skills/fahrenheit-451/references/tmp-worklog-template.md)