feat(bloat): rename fbuild symbols to fbuild bloat

[zackees]

Summary

Closes#438 (Phase 2 of #434). Stacked on top of #436 — please merge that first.

• Renames Commands::Symbols → Commands::Bloat. Adds clap alias = "symbols" so the legacy spelling still parses to the same handler.
• Renames symbols_cmd.rs → bloat_cmd.rs, run_symbols → run_bloat.
• Marks --nm, --cppfilt, --map with #[arg(hide = true)]. They keep working as overrides for advanced use, but the public surface is now just <input>, --build-info, --json, --output-dir, --top.
• Renames docs/symbols.md → docs/bloat.md; updates docs/CLAUDE.md index entry.
• Adds two parser tests: bloat_command_parses (canonical spelling) and symbols_alias_still_parses_as_bloat (back-compat).

The symbol_analysis flag on fbuild build is not renamed in this PR — that's Phase 5 (#441) which turns it into --bloat.

Test plan

• soldr cargo check -p fbuild-cli --all-targets ✅
• soldr cargo clippy -p fbuild-cli --all-targets -- -D warnings ✅
• soldr cargo test -p fbuild-cli --bin fbuild — 27 passed (was 25 + 2 new alias tests)

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