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/cli/commands/commit.py

@@ -4,7 +4,7 @@ Docker bottles are committed to a local Docker image. Macos-container
 bottles are exported and rebuilt as a local Apple Container image.
 Firecracker bottles stream the guest rootfs out over SSH and rebuild a
 local Docker image. The resulting reference is stored in per-bottle
-state so the next `./cli.py resume <slug>` boots from the snapshot
+state so the next `bot-bottle resume <slug>` boots from the snapshot
 instead of rebuilding from the Dockerfile.
 """
 
@@ -37,7 +37,7 @@ def cmd_commit(argv: list[str]) -> int:
     if slug is None:
         active = enumerate_active_agents()
         if not active:
-            die("no active bottles; start one with `./cli.py start`")
+            die("no active bottles; start one with `bot-bottle start`")
         choices = [a.slug for a in active]
         slug = tui.filter_select(choices, title="Select bottle to commit")
         if slug is None: