docs: name bot-bottle, not ./cli.py, in every instruction

`doctor` told users to run `./cli.py backend setup`. cli.py is a four-line
wrapper at the repo root that calls bot_bottle.cli:main, and it does not ship —
[tool.setuptools.packages.find] includes only bot_bottle*, so anyone who
installed rather than cloned has no such file. Confirmed against a real
install: the user's tree contains exactly one executable, `bot-bottle`, and no
cli.py anywhere, while doctor recommended `./cli.py` three times. Invisible in
development, where ./cli.py works fine from a checkout, which is why only a
clean-install test surfaced it.

The two entry points are the same code, so the fix is to name the one that
always exists. 141 replacements across 45 files: the runtime messages that
caused this, plus README, docs, PRDs, research notes and test prose, so nothing
teaches the invocation a user cannot run.

scripts/demo.sh is deliberately untouched — it *executes* ./cli.py from a
checkout, where that is the correct and available path.

Verified end to end: a sandbox install now reports
"Run: bot-bottle backend setup --backend=firecracker", and bot-bottle is on
that user's PATH. Unit suite unchanged against the pre-existing baseline.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WEfZZhakx13bxTfXcZCoS5

bot_bottle/backend/firecracker/netpool.py

@@ -3,7 +3,7 @@ config renderers (shell command + NixOS module) shown to operators.
 
 The Firecracker backend needs a privileged one-time network setup:
 a pool of point-to-point TAP devices (owned by the invoking user, so
-`./cli.py start` never needs root) and a dedicated nftables table that
+`bot-bottle start` never needs root) and a dedicated nftables table that
 isolates every VM. The pool parameters live in exactly one place —
 `netpool.defaults.env`, a plain KEY=VALUE file next to this module —
 and every consumer reads *that*: this module (below), the shell script
@@ -315,11 +315,11 @@ def allocate(slug: str) -> tuple[Slot, IO[str]]:
         return s, handle
     die(f"Firecracker TAP pool exhausted ({pool_size()} slots, all in "
         f"use). Stop a running bottle or raise BOT_BOTTLE_FC_POOL_SIZE "
-        f"and re-run `./cli.py backend setup --backend=firecracker`.")
+        f"and re-run `bot-bottle backend setup --backend=firecracker`.")
     raise AssertionError("unreachable")
 
 
-# --- config renderers (shown by `./cli.py backend setup`) -----------
+# --- config renderers (shown by `bot-bottle backend setup`) -----------
 
 # The persistent unit is the portable install: the same systemd oneshot
 # on every systemd distro (Debian/Ubuntu/Fedora/RHEL/Arch/…).