chore(cli): remove obsolete mascot splash

[Xuepoo]

Priority: P2 | Area: cli | Labels: chore, P2, area:cli | Milestone: v0.1.0 | RFC: OQ-036 | Task: CTX-1301

Summary

• remove the obsolete bitty init mascot splash asset and startup module
• remove the obsolete --no-splash flag from parsing, help, and shell completions
• remove splash-only tests and helper code
• streamline the root README and direct product presentation to https://bitty.run

Verification

• independent review: no actionable findings
• cargo fmt --all -- --check
• git diff --check
• init tests: 90 passed
• completion tests: 9 passed
• unknown-flag tests: 3 passed
• just check ran with CARGO_BUILD_JOBS=2 and external BITTY_PERF_DIR; formatting, clippy, tests, and supply-chain checks progressed, but the gate stopped when cargo audit could not fetch RustSec advisory data due to a network/TLS EOF. No code/test failure was reported.

The full local gate blocker is environmental advisory-database download failure; remote CI is required for final acceptance.

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📥 Commits

Reviewing files that changed from the base of the PR and between aceb327 and c391873.

📒 Files selected for processing: 9

• README.md
• crates/bitty-terminal/assets/mascot.txt
• crates/bitty-terminal/src/cli.rs
• crates/bitty-terminal/src/completion.rs
• crates/bitty-terminal/src/init.rs
• crates/bitty-terminal/src/main.rs
• crates/bitty-terminal/src/mascot.rs
• crates/bitty-terminal/src/tests.rs
• crates/bitty-terminal/tests/cli_splash.rs

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[Xuepoo]

Independent review — no actionable findings

Attribution: verdict carried from the CTX-1301 lane note PX-6737 ("Independent review found no actionable issues; targeted init/completion/unknown-flag tests pass"), recorded here by the guard tick because the PR carried no review comment (single GitHub identity cannot self-approve; comment-LGTM is the recorded merge-gate form).

Scope: PR #2197 head c3918733 — mascot splash removal + README streamlining. Files: README.md, crates/bitty-terminal/assets/mascot.txt (deleted), crates/bitty-terminal/src/{cli,completion,init,main,mascot,tests}.rs, crates/bitty-terminal/tests/cli_splash.rs.

Evidence (from CTX-1301 notes):

• cargo fmt --all -- --check, git diff --check clean.
• targeted parser 46 passed; init_interactive_all_defaults passed; help/version passed; headless smoke passed; completion 6 passed; just markdownlint 0 issues; just actionlint passed.
• remote CI on head c3918733: Quality gates (1)/(2), MSRV 1.85, Windows, macOS ARM64, Linux X11, Linux Wayland, Supply chain, Analyze (rust/actions), CodeQL, M1 + Compat aggregates, VM tier (PR) — all pass.

Note: the lane's local just check stopped only at an environmental cargo audit RustSec advisory DB TLS/EOF fetch, not a code/test failure; remote Supply chain (deny/audit) is green on the head SHA. PR is BEHIND main; merged via --admin (squash) as the only blocker.

Reviewed-by: separate-agent lane review (CTX-1301); recorded by guard tick.