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+---
+name: haussmann
+description: Perform a zero-based Rust source-tree audit and reorganization pass. Use when Codex needs to fix incoherent module layout, thin or bloated subtrees, misplaced files, weak crate boundaries, or scattered shared support code by planning a target tree and executing disciplined path surgery rather than ad hoc moves.
+---
+
+# Haussmann
+
+Read the target repo's `AGENTS.md` first if it exists.
+
+Rust only. This skill is about source layout, module topology, and path ownership. It is not the general abstraction-refactor skill.
+
+## Contract
+
+- Require a concrete Rust subtree, crate, or crate set.
+- Default to `audit_plus_refactor` unless the user clearly wants findings only.
+- Inventory every directory, every `Cargo.toml`, and every `*.rs` file in scope.
+- Do not deep-read every file. File reorg is structural work first.
+- Create one persistent `/tmp` worklog before the first deep read. Chat is summary only; the worklog is the durable source of truth.
+- Run a cheap whole-tree symbol sweep before planning moves.
+- Partition the tree into intentional logical cliques before deep reading.
+- Write a `/tmp` checkpoint after every wave before reading more files.
+- Do not move code until the target tree and move map both exist.
+- Force one final path decision for every file and directory in scope.
+- Restrict any edits to serve the reorg: module declarations, imports, reexports, etc. No business logic changes are in scope.
+- Create domain-scoped support modules when repeated subtree-local operations clearly want a shared home.
+
+## Layout Smells
+
+Actively look for:
+
+- gigafiles: monoliths that ought to be broken up into a tree
+- thin subtrees: directories with one meaningful child and no real boundary
+- false depth: extra nesting with no conceptual payload
+- conceptually void support sinks: ownerless `util`, `common`, `helpers`, `misc`
+- suppressed shared support: obvious repeated subtree-local helper logic left scattered
+- thin helper diffusion: many sibling files each carrying one tiny support routine for the same owner
+- split domains: one concept scattered across unrelated peers
+- buried core: central domain code hidden under historical or mechanical paths
+- top-level noise: low-value implementation detail promoted to root visibility
+- temporal naming: `old`, `new`, `tmp`, `v2`, `legacy`
+- cross-crate leakage: code living in a crate or subtree that does not own the concept
+
+## Flow
+
+### 0. Create the worklog
+
+Create a path shaped like:
+
+```text
+/tmp/haussmann-<repo-or-dir>-<subtree-slug>.md
+```
+
+Seed it with the embedded worklog skeleton from `Embedded Forms`.
+
+### 1. Lock scope and inventory
+
+Enumerate the full tree before making any move plan.
+
+Use fast discovery, for example:
+
+```bash
+find <subtree> -type d | sort
+rg --files <subtree> -g '*.rs' -g 'Cargo.toml'
+```
+
+Persist both manifests into the worklog immediately.
+
+Every file row must eventually receive one final path decision.
+Every directory row must eventually be justified or removed.
+
+### 2. Run a structural pass before content reads
+
+Do not start by reading source files linearly.
+
+First inspect structure only:
+
+- current directory tree
+- crate boundaries
+- `lib.rs`, `main.rs`, `mod.rs`
+- package and crate names
+- obvious test, bench, example, and support directories
+- obvious naming pathologies
+- obvious thin or bloated subtrees
+
+Record structural hotspots in the worklog.
+
+### 3. Run a cheap whole-tree symbol sweep
+
+Sweep all Rust files cheaply. Do not deep-read them yet.
+
+Collect signals like:
+
+- file stems
+- module roots
+- top-level `fn`, `struct`, `enum`, `trait`, and `type` names
+- repeated helper-name families
+- repeated operation families across sibling files
+- tiny files that appear to be support fragments for the same owner concept
+
+The point is to spot likely shared-support candidates without turning the task into a read-every-file slog.
+
+### 4. Plan logical cliques
+
+Group ambiguous or related paths into small logical cliques before deep reading.
+
+Good clique causes:
+
+- one suspected thin subtree chain
+- one conceptually void support directory and its likely rightful homes
+- one domain split across multiple peers
+- one public API surface plus its internal implementation subtree
+- one crate-boundary question
+- one repeated helper family revealed by the symbol sweep
+- one likely shared-support extraction under a clear parent domain
+
+Cliques may overlap. Keep deep-read waves to 2-8 files.
+
+### 5. Run bounded deep-read waves
+
+Deep-read only what is needed to resolve ownership and boundary questions.
+
+For each wave:
+
+- read at most 8 files
+- prefer module roots, public entrypoints, move candidates, and shared-support candidates
+- use `rust_analyzer` aggressively for references, definitions, rename feasibility, and boundary tracing
+- prefer live use sites over declaration-first wandering
+- update the worklog before reading more files
+
+Not every file needs deep reading.
+Every ambiguous move candidate and every flagged shared-support candidate does.
+
+### 6. Write the target tree before moving anything
+
+After structural coverage and targeted deep reads, write the desired tree shape first.
+
+For every kept directory, state its owning concept in one short line.
+If you cannot state the owner, the directory probably should not exist.
+
+The target tree must answer:
+
+- what belongs at the root
+- which directories are real domain boundaries
+- which directories are clutter and should die
+- where each source file should live
+- which crate or subtree owns each concept
+- where shared support should live, if it should exist at all
+
+### 7. Populate the move map
+
+Use one row per file or directory that matters.
+
+If the same support operation appears in 3+ files under a clear owner subtree, either extract a support module or record an explicit rejection reason.
+
+### 8. Execute mechanical tree surgery
+
+Only after the move map exists:
+
+- create target directories
+- move and rename files
+- repair `mod` declarations
+- repair `pub use` surfaces
+- repair imports and path references
+- repair manifest paths and test references
+- extract small shared support modules when the move map called for them
+- remove empty directories and dead wrapper modules
+
+Do not perform broad semantic redesign under cover of layout work.
+If a file obviously wants splitting or abstraction cleanup beyond layout-serving edits, record it as follow-on work.
+
+### 9. Verify
+
+After moves:
+
+- run the narrowest valid `cargo check` or `cargo test` surface first
+- widen if needed
+- search for stale module paths and imports
+- scan for empty directories
+- scan for newly created thin subtrees
+- update the residual sweep
+
+The residual sweep must answer:
+
+- what moved
+- what stayed and why
+- what shared support was extracted
+- what blockers remain
+- what semantic follow-on work is now exposed
+
+## Embedded Forms
+
+### Worklog Skeleton
+
+```text
+worklog_path:
+scope_root:
+inspection_mode: audit_only | audit_plus_refactor
+wave_size_limit: 8
+
+directory_manifest:
+file_manifest:
+structural_hotspots:
+symbol_sweep:
+clique_plan:
+wave_checkpoints:
+target_tree:
+move_map:
+blocker_register:
+residual_sweep:
+```
+
+Rules:
+
+- create this file before the first deep read
+- update it after every 8-file wave before reading more files
+- treat it as the durable source of truth for the run
+- report the final worklog path in the user-facing response
+
+### Wave Checkpoint
+
+```text
+clique_id:
+purpose:
+files_read:
+ownership_hypotheses:
+move_candidates:
+shared_support_candidates:
+blockers:
+likely_rereads:
+```
+
+Rules:
+
+- checkpoint every deep-read wave
+- do not read a 9th file before writing the checkpoint
+- keep checkpoints concrete and structural
+- a file may appear in multiple cliques when ownership or support extraction reasoning demands it
+
+### Move Map
+
+```text
+| kind | current_path | owner_concept | action | target_path | reason | required_rewrites |
+|------|--------------|---------------|--------|-------------|--------|-------------------|
+| dir  | src/common | none_stable | flatten_dir | src/ | thin directory with no boundary value | mod paths, imports |
+| file | src/util/id.rs | identity | move | src/identity/id.rs | domain file buried in ownerless support path | mod decls, uses, tests |
+| dir  | src/mip | mip | keep_path | src/mip | real domain owner | |
+| file | src/mip/node_bounds.rs | mip_support | move | src/mip/bounds.rs | repeated subtree-local bounds operations want one home | imports, tests |
+| file | src/http/client.rs | transport_client | keep_path | src/http/client.rs | stable boundary already in the right place | |
+```
+
+Allowed `action` values:
+
+- `keep_path`
+- `rename`
+- `move`
+- `flatten_dir`
+- `split_dir`
+- `merge_dir_then_remove`
+- `extract_support_module`
+- `extract_subtree`
+- `flag_blocker`
+
+Rules:
+
+- every file in scope must end in exactly one final path decision
+- every directory in scope must be justified or removed
+- `flag_blocker` is only for genuine ambiguity where a wrong move would distort a public surface or crate boundary
+- do not hide indecision in vague prose; put it in the move map
+
+## Final Response
+
+Always include:
+
+- the `/tmp` worklog path
+- inventory coverage summary
+- structural hotspot summary
+- target-tree summary
+- move-map summary
+- verification summary
+- residual blockers or follow-on work
+
+If you edited code, also include:
+
+- directories removed
+- files moved or renamed
+- support modules created or consolidated
+- public-surface changes, if any
+
+## Hard Failure Modes
+
+- do not turn file reorg into a read-every-file exercise
+- do not start with random deep reads before inventory and symbol sweep
+- do not preserve a directory that cannot state an owning concept
+- do not create a subtree with one file unless the boundary is already real
+- do not leave obvious subtree-local duplication scattered merely to avoid creating a shared support module
+- do not perform broad semantic rewrites under the banner of reorg
+- do not leave path decisions implicit or unrecorded
+- do not preserve temporal names like `old`, `new`, or `v2` by inertia
+- do not guess on crate-boundary blockers; flag them explicitly
+- do not stop after moves without verification