feat(hh): /pw command, RAM-only direnv autostart, robust lets-hack; coven→clergy

- add /pw (alias /password): reveal this room's password locally (never
  broadcast); surfaced in the F1 help overlay and the join hint
- direnv-autostart/: cd-to-launch a single real-user session via direnv;
  password is minted in memory at launch (never written to disk, matching the
  RAM-only model) and scoped to the child process. setup.sh installs direnv,
  hooks bash/zsh, and `direnv allow`s the dir
- lets-hack.sh: boot a FRESH server by default (replacing any live one) with a
  --reuse opt-out; add -h/--help/-help; guard against killing the tmux session
  you're attached to; switch-client into the coven when run inside tmux
- rename coven→clergy across rust/python/scripts; tests/test_coven.py→test_clergy.py
- snapshots in-progress hack-house client work (sandbox, themes, net, ui)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hh/src/theme.rs

@@ -2,9 +2,14 @@
 //! occult-monochrome: black ground, white/grey ink, ⛧ accents. Override with a
 //! TOML file via `--theme <path>`.
 
+use anyhow::Context;
 use ratatui::style::Color;
 use serde::Deserialize;
 
+/// Where the bundled `*.toml` vestments live, so `/theme <name>` can resolve a
+/// bare name to a file at runtime (mirrors sbx.rs's script path const).
+pub const THEMES_DIR: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/themes");
+
 #[derive(Debug, Clone, Deserialize)]
 #[serde(default)]
 pub struct Theme {
@@ -18,8 +23,14 @@ pub struct Theme {
     pub system: Color,
     pub input: Color,
     pub roster_me: Color,
+    /// Panel/background fill. `Reset` = the terminal's own background (no fill);
+    /// a solid colour lifts the text onto a contrasting surface for legibility.
+    pub bg: Color,
     /// Width of the roster column.
     pub roster_width: u16,
+    /// Glyph flanking the "hack-house" title (and used for occult accents).
+    /// Defaults to ⛧ (inverted pentagram); themes can pick their own sigil.
+    pub sigil: String,
 }
 
 impl Default for Theme {
@@ -37,7 +48,9 @@ impl Default for Theme {
             system: Color::Rgb(0xb4, 0x6c, 0xff),    // system / occult = purple
             input: Color::Rgb(0x39, 0xff, 0x14),
             roster_me: Color::Rgb(0xff, 0x39, 0xc0), // you / owner = hot magenta
+            bg: Color::Reset,                        // ride the terminal's own black
             roster_width: 22,
+            sigil: "⛧".into(),                       // inverted pentagram
         }
     }
 }
@@ -47,6 +60,30 @@ impl Theme {
         let s = std::fs::read_to_string(path)?;
         Ok(toml::from_str(&s)?)
     }
+
+    /// Resolve a bare vestment name (e.g. "neon") to a bundled `themes/<name>.toml`.
+    /// Used by the in-session `/theme` command for live switching.
+    pub fn by_name(name: &str) -> anyhow::Result<Self> {
+        let path = format!("{THEMES_DIR}/{name}.toml");
+        Self::load(&path).with_context(|| format!("theme '{name}' ({path})"))
+    }
+
+    /// Names of the bundled vestments, sorted, for `/theme` with no argument.
+    pub fn available() -> Vec<String> {
+        let mut names: Vec<String> = std::fs::read_dir(THEMES_DIR)
+            .into_iter()
+            .flatten()
+            .flatten()
+            .filter_map(|e| {
+                e.file_name()
+                    .to_str()
+                    .and_then(|f| f.strip_suffix(".toml"))
+                    .map(str::to_string)
+            })
+            .collect();
+        names.sort();
+        names
+    }
 }
 
 #[cfg(test)]