The developer environment hides where dotfiles hide

dev.env and dev.env.example become .dev.env and .dev.env.example, and the five
skills that name them follow. The .gitignore rule takes the dot too; it matches
the exact name, so the example stays tracked while the real one stays out.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.claude/skills/add-narrow-emoji/SKILL.md

@@ -34,8 +34,8 @@ the commonest answer to "please add this one".
 
 1. **Classify the emoji.** Run, from the repo root:
 
-   The interpreter below is `$DEV_VENV_PYTHON` from `dev.env` at the repo root (gitignored;
-`dev.env.example` shows the shape) — read it first.
+   The interpreter below is `$DEV_VENV_PYTHON` from `.dev.env` at the repo root (gitignored;
+`.dev.env.example` shows the shape) — read it first.
 
 ```
    $DEV_VENV_PYTHON .claude/skills/add-narrow-emoji/classify.py <emoji>

.claude/skills/fix-ans-nulls/SKILL.md

@@ -15,8 +15,8 @@ stays exactly where it was, so the file's length never changes.
 
 ## Run
 
-The interpreter below is `$DEV_VENV_PYTHON` from `dev.env` at the repo root (gitignored;
-`dev.env.example` shows the shape) — read it first.
+The interpreter below is `$DEV_VENV_PYTHON` from `.dev.env` at the repo root (gitignored;
+`.dev.env.example` shows the shape) — read it first.
 
 ```
 $DEV_VENV_PYTHON .claude/skills/fix-ans-nulls/denul.py --dry-run --width 71 meshterm/assets/splash/logo.71.ans

.claude/skills/profile-picocalc/SKILL.md

@@ -14,8 +14,8 @@ on came from the real app on `/dev/tty1`.
 
 ## Reaching the device
 
-The address, login, key and password are **not in this file**. Read `dev.env` at the
-repo root first (gitignored; `dev.env.example` shows the shape) — the `$DEV_*` names
+The address, login, key and password are **not in this file**. Read `.dev.env` at the
+repo root first (gitignored; `.dev.env.example` shows the shape) — the `$DEV_*` names
 below are its keys, and everything here is written to be run with them substituted.
 
 `ssh -i $DEV_PICOCALC_SSH_KEY $DEV_PICOCALC_USER@$DEV_PICOCALC_HOST` (key installed;

.claude/skills/purge-test-data/SKILL.md

@@ -13,8 +13,8 @@ carrying the simulator's fingerprints and nothing else.
 
 ## Run
 
-The interpreter below is `$DEV_VENV_PYTHON` from `dev.env` at the repo root (gitignored;
-`dev.env.example` shows the shape) — read it first.
+The interpreter below is `$DEV_VENV_PYTHON` from `.dev.env` at the repo root (gitignored;
+`.dev.env.example` shows the shape) — read it first.
 
 ```
 $DEV_VENV_PYTHON .claude/skills/purge-test-data/purge.py --dry-run

.claude/skills/verify/SKILL.md

@@ -8,8 +8,8 @@ model: haiku
 
 ## Launch
 
-- Machine-specific values (this venv, the BLE companions below) live in `dev.env` at
-  the repo root — gitignored, with `dev.env.example` showing the shape. Read it first;
+- Machine-specific values (this venv, the BLE companions below) live in `.dev.env` at
+  the repo root — gitignored, with `.dev.env.example` showing the shape. Read it first;
   the `$DEV_*` names here are its keys.
 - Venv interpreter: `$DEV_VENV_PYTHON`
 - Run the app as a module: `python -m meshterm …` (no install step needed).

.dev.env.example

@@ -1,12 +1,12 @@
 # MeshTerm developer environment — the machine-specific half of the .claude/ skills.
 #
-# Copy to `dev.env` (gitignored) and fill in your own values. Nothing in here is read by
+# Copy to `.dev.env` (gitignored) and fill in your own values. Nothing in here is read by
 # the app: `meshterm` is configured by `config.toml` and its own `MESHTERM_*` variables.
 # These are only for driving *your* hardware from a dev session, so every name is
 # `DEV_`-prefixed and cannot collide with the app's.
 #
-#   set -a; . ./dev.env; set +a      # sh/bash
-#   Get-Content dev.env | ...        # or just read the values; nothing sources it for you
+#   set -a; . ./.dev.env; set +a      # sh/bash
+#   Get-Content .dev.env | ...        # or just read the values; nothing sources it for you
 
 # --- this workstation ---------------------------------------------------------------
 # Full path to the venv interpreter, so a skill can run the app without an install step.

.gitignore

@@ -23,8 +23,8 @@ venv/
 output/
 
 # Developer environment: the machine-specific half of the .claude/ skills (device
-# addresses, logins, the local venv path). dev.env.example is tracked and shows the shape.
-dev.env
+# addresses, logins, the local venv path). .dev.env.example is tracked and shows the shape.
+.dev.env
 
 # Built radio firmware (scripts/xiao-radio/build-firmware.sh writes it here)
 scripts/xiao-radio/*.uf2