diff --git a/doc/evolution.md b/doc/evolution.md
index 87fb27e..72e161d 100644
--- a/doc/evolution.md
+++ b/doc/evolution.md
@@ -1,6 +1,6 @@
 # Architectural Evolution
 How the Ollie system-of-systems emerged and evolved.
-~1300 commits over ~3.5 months (Apr 11 – Jul 30, 2026).
+~1400 commits over ~3.75 months (Apr 11 – Aug 4, 2026).
 ## Timeline
 ```mermaid
 gantt
@@ -29,13 +29,16 @@ gantt
     section Control Planes
     D-Bus adapter (ollied)         :done, 2026-06-25, 20d
     D-Bus embedded in srv          :done, 2026-07-15, 10d
+    D-Bus removed                  :done, 2026-07-31, 1d
     section Late Evolution
     Remote execution               :done, 2026-07-05, 15d
     Elevation broker               :done, 2026-07-10, 15d
     Tool registry (lazy)           :done, 2026-07-20, 10d
-    Reactions / feedback           :done, 2026-07-22, 8d
     FUSE → 9P client               :done, 2026-07-25, 5d
     The Great Flattening           :done, 2026-07-29, 2d
+    9P Declarative EDSL            :done, 2026-08-02, 1d
+    Zero built-in tools            :done, 2026-08-02, 2d
+    EDSL extraction + cleanup      :done, 2026-08-03, 2d
 ```
 ## Phase 1: Monorepo Bootstrap (Apr 11)
 Started as independent git repos unified under a monorepo with submodules.
@@ -826,3 +829,105 @@ The result: the Go core is a 9P file server and an agent loop, nothing more. All
 | kde gui | 6,491 |
 | **Total** | **23,157** |
 Zero dead exported functions remain (verified via LSP + grep across all repos).
+
+## Phase 19: EDSL Extraction & Structural Cleanup (Aug 3–4)
+
+The declarative EDSL that powered the 9P filesystem was extracted into a
+standalone, reusable library. Alongside this, accumulated cruft was removed:
+dead packages, obsolete scripts, and features that no longer justified their
+complexity.
+
+### fsedsl: Standalone Library
+
+The generic EDSL types and builder logic extracted from `fs/` into `fsedsl/`:
+
+```
+fsedsl/
+├── fsnode.go     FsNodeDecl[C], NodeOption[C], Dir/Leaf/Each constructors
+├── builder.go    BuildTree — walks spec, validates, wires handlers
+├── tree.go       Tree, File, FileConfig, FileTree types
+├── option.go     Doc, Read, Write, Stream, BlockOnce, Request, etc.
+└── README.md     Integration guide
+```
+
+The library is **protocol-agnostic** — it knows nothing about 9P. It produces
+a `*Tree` structure that any protocol (9P, FUSE, HTTP, gRPC) can walk.
+The `fs/` package becomes a thin adapter: type aliases + ollie-specific handlers.
+
+Key design:
+- Generic over context type `C` — ollie uses `HandlerCtx`, others can use anything
+- Single `BuildTree[C]()` call validates and wires the entire namespace
+- Validation at build time: no leaf handlers on directories, at most one blocking
+  variant per file, template nodes require `List`, ownership inheritance
+
+### fs/ Package Consolidation
+
+After EDSL extraction, the fs package was restructured:
+
+**Before** (scattered):
+```
+fs/
+├── spec.go           namespace declaration
+├── builder.go        tree builder (moved to fsedsl)
+├── adapter.go        type aliases
+├── session/          sub-package with 6 files
+│   ├── files.go
+│   ├── root.go
+│   ├── perm.go
+│   └── ...
+└── elevatefiles.go
+```
+
+**After** (flat, by scope):
+```
+fs/
+├── spec.go           single source of truth — entire namespace
+├── fsnode.go         type aliases from fsedsl
+├── builder.go        BuildTree wrapper
+├── rootfiles.go      root-level handlers (backends, models, help, ctl)
+├── sessionfiles.go   session-level handlers (env, ctl, name)
+├── agentfiles.go     agent-level handlers (prompt, chat, state, tools)
+├── elevatefiles.go   elevation broker handlers
+└── procfiles.go      detached process handlers
+```
+
+No sub-packages. Handler files are organized by 9P tree scope.
+
+### Session Package Refactors
+
+Major restructuring of session lifecycle:
+
+- **Session/Agent split** — `session.Session` manages lifecycle, `agent.Agent` manages conversation. Clear ownership boundaries.
+- **Persistence to session/** — `fs/persist.go` removed, persistence logic moved to `session/` package
+- **Manager eliminated** — Package-level registry replaces `Manager` struct. CRUD via `session.Lookup()`, `session.All()`, `session.CreateFromRoot()`, etc.
+- **Remote promoted to session level** — Remote execution managed at session, not agent level
+
+### Dead Code Removal
+
+| Removed | Reason |
+|---------|--------|
+| `cmd/Ollie` (Acme frontend) | Acme users switched to `ollie-9p` CLI directly |
+| `mount/` package | FUSE mount replaced by 9P client; `ollie-remount` handles recovery |
+| `ollie-watchdog` script | No longer needed — daemon lifecycle via systemd |
+| `doc/experiments/` | Historical experiments moved to git history |
+| `doc/help.md` | Now generated dynamically from `Doc()` strings in spec |
+
+### o CLI Improvements
+
+The terminal CLI (`data/scripts/o`) was simplified:
+
+- **Removed auto-session/agent** — Context must be set explicitly via `export` or `eval $(o env ...)`. Eliminates slow `ollie-9p read session/idx` calls.
+- **Path classification** — Paths categorized as root/session/agent level. Clear error messages: "chat requires agent context".
+- **TUI percentage layout** — Fixed-size splits replaced with percentages (`-l 25%`). Adapts to terminal size.
+- **Block marker filtering** — Chat stream piped through `grep -v '\[\[\[.*\]\]\]'` to hide internal markers.
+
+### Documentation
+
+- Removed outdated docs (`doc/experiments/`, stale `help.md`)
+- Renamed doc files to lowercase-kebab-case
+- Updated usage.md for new `o` CLI behavior
+- Removed mount/ and watchdog references from architecture docs
+
+### Gantt Update
+
+The timeline now extends to Aug 4, 2026 — ~3.75 months of development.