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/docker/setup.py

@@ -8,7 +8,7 @@ pointer, and `status()` reports whether docker is usable.
 This is intentionally minimal; a richer version (daemon config checks,
 gVisor/runsc install guidance, rootless-docker hints) is tracked
 separately. Reached via `DockerBottleBackend.setup` / `.status`, which
-the generic `./cli.py backend {setup,status}` dispatches to.
+the generic `bot-bottle backend {setup,status}` dispatches to.
 """
 
 from __future__ import annotations
@@ -69,7 +69,7 @@ def teardown() -> int:
     sys.stderr.write(
         "Docker backend: nothing to undo — it provisions no privileged host "
         "state (networks and the gateway are per-launch and are "
-        "removed by `./cli.py cleanup`). Docker itself is left installed.\n"
+        "removed by `bot-bottle cleanup`). Docker itself is left installed.\n"
     )
     return 0
 
@@ -89,5 +89,5 @@ def status() -> int:
     runsc = _docker_on_path() and _util.runsc_available()
     sys.stderr.write(f"gVisor runsc runtime: {'registered' if runsc else 'not registered (optional)'}\n")
     if not ok:
-        sys.stderr.write("\nRun: ./cli.py backend setup --backend=docker\n")
+        sys.stderr.write("\nRun: bot-bottle backend setup --backend=docker\n")
     return 0 if ok else 1