docs: rewrite README as a user-facing brew install + usage guide

@@ -1,37 +1,37 @@
-# tt — a Charm-native front-end for tock
+# ticktock
 
-`tt` makes it easy to review, edit, and backfill time tracked with the
-[`tock`](https://github.com/dhth/tock) CLI. tock stays the source of truth;
-`tt` only reads and writes through it.
+A Charm-native front-end for the [`tock`](https://github.com/dhth/tock) time
+tracker. Review, edit, and backfill your tracked time in a fast terminal UI.
+tock stays the source of truth — ticktock only reads and writes through it. The
+command is `tt`.
 
 ## Install
 
-    make install            # builds bin/tt, symlinks it into ~/.local/bin
+```sh
+brew tap humdrum/tap https://codex.humdrum.me/git/homebrew-tap.git
+brew trust humdrum/tap        # newer Homebrew gates third-party taps
+brew install tt
+```
 
-Once published to the tap:
-
-    brew install humdrum/tap/tt
+Upgrade later with `brew upgrade tt`.
 
 ## Requirements
 
-- **`tock` on PATH.** `tt` owns no storage — every read and write shells out to
-  your installed [`tock`](https://github.com/dhth/tock). Tested against tock
+- **`tock` on PATH.** ticktock owns no storage — every read and write shells out
+  to your installed [`tock`](https://github.com/dhth/tock). Tested against tock
   **v1.9.8**; older versions may predate the `report --json` / `add -s/-e`
-  contract `tt` relies on.
-- **tock's sqlite backend is strongly recommended.** `tt` works on any backend
-  for reading and adding, but editing an entry is a remove-then-re-add, and on
-  the file/markdown backend tock's `report --json` can omit tags/notes — so an
-  edit could silently drop them. On sqlite the full row round-trips intact.
+  contract it relies on.
+- **tock's sqlite backend is strongly recommended.** ticktock works on any
+  backend for reading and adding, but editing an entry is a remove-then-re-add,
+  and on the file/markdown backend tock's `report --json` can omit tags/notes —
+  so an edit could silently drop them. On sqlite the full row round-trips intact.
 - **`sqlite3` CLI (optional).** Used only to pull history for autocomplete when
   the sqlite backend is active. Missing it just falls back to `tock last`;
   nothing breaks.
-- **Building from source needs Go ≥ 1.26.** The Homebrew formula is a source
-  build and pulls the Go toolchain automatically.
 
-`tt menu`'s full-screen actions (watch/list/analyze) hand the terminal over to
-tock.
+## Usage
 
-## Commands
+Run `tt` for the command list. The three views:
 
 - `tt timeline [date|today|yesterday]` — spatial day grid: fixed slot rows,
   range-select to add an entry, edit/delete logged sessions, per-project
@@ -39,7 +39,8 @@   colors. (Alias: `tt tui`.)
 - `tt day [date|today|yesterday]` — list view with per-project totals and
   Enter-to-edit. `←/→` change day.
 - `tt menu` — guided menu over tock: start, stop, current, continue, note,
-  tag, report, list, last, watch, analyze.
+  tag, report, list, last, watch, analyze. Full-screen actions
+  (watch/list/analyze) hand the terminal over to tock.
 
 In the add/edit form, **project**, **description**, and **tags** autocomplete
 from your tock history (Ctrl+E accepts a suggestion). Values stay free text.
@@ -56,25 +57,6 @@ | `slot_minutes` | `30`    | grid row height in minutes (min 5)       |
 | `grid_start`   | `07:00` | earliest grid hour (auto-expands to data)|
 | `grid_end`     | `21:00` | latest grid hour (auto-expands to data)  |
 | `project`      | `""`    | default project for a new entry          |
-
-## Build & test
-
-    make build      # -> bin/tt
-    make test
-    make vet
-
-## Release
-
-Releases ship through [custard](https://codex.humdrum.me/r/custard) to the
-self-hosted Homebrew tap. Config lives in `.custard.yaml` (source build,
-`depends_on "go"`). Push `main` first, then from the repo root:
-
-    custard release v0.1.0
-
-custard runs the CI checks, tags the commit, pushes it, and the forge
-renders `Formula/tt.rb` into the tap. Install requirements (tock, sqlite)
-live under [Requirements](#requirements) — the auto-formula does not repeat
-them.
 
 ## License