feat: tb wc with POSIX flags, glob, recursive walk, and MCP support

[Citizen4our]

Summary

Extends tb wc to GNU/POSIX-like behaviour: -l/-w/-c/-m flags, final-segment glob, recursive directory walk (-r), a single JSON-RPC round-trip per invocation, and an updated MCP tool with catalog examples. Path resolution and metric filtering live in the library crate; CLI, shell, RPC, and MCP share the same semantics and response shapes.

Motivation

• tb wc -l /docs/* did not behave like users expect from Linux wc (glob was only partially handled on the CLI read path, not in server-side wc).
• Need Linux-like errors (is a directory) and a hint to use -r when a glob matches directories only.
• MCP agents need structured wc with documented request/response examples.

Changes

Library (tabularium)

Area	Detail
glob_path.rs (new)	Final-segment glob, path_is_directory, recursive file collection, resolve_wc_file_paths
wc.rs (new)	WcMetricsFilter, JSON helpers, sum_wc_stats, unit tests
rpc/client.rs	Client::wc(), types WcResponse / WcMetrics / WcFileEntry; legacy document_wc kept
Cargo.toml	globset under feature db
db/meta.rs	WcStats::from_totals

Server (tabularium-server)

Area	Detail
web.rs	RPC wc: glob, recursive, metric flags; { files, total } only when two or more files resolve
mcp.rs	WcArg, expanded catalog and #[tool(description)] with examples
res/mcp/help.txt	wc paragraph
tests/text_ops.rs	Glob batch, directory guard, dirs-only hint, recursive walk, single-glob flat response

CLI (tabularium-cli)

Area	Detail
main.rs	Wc flags and -r; cleaner error output via print_cli_message
execute.rs	Single client.wc() call; GNU/TTY formatting; shared print_cli_message
shell.rs	flags_for("wc"), parse tests, errors via print_cli_message
Cargo.toml	Removed direct globset dependency (via library)

Tests & docs

• tests/test_cli_wc.py (new) — glob, directory error, recursive glob, single-file -l
• docs/json-rpc-methods.md — updated wc params and response

Refactors

• DRY in wc.rs (wc_metrics_object, format_optional_counts, column_labels)
• Simplified print_wc_gnu_line in CLI
• Batch JSON only when paths.len() > 1 (one glob match → flat object, same as a literal path)
• Unified CLI and shell error UX (strips invalid input: / not found: prefixes)

Behaviour

Input	Result
tb wc -l /docs/readme.md	single number (pipe-friendly)
tb wc -l '/docs/*'	per-file lines + total
tb wc -l /projects/bms	error: is a directory + hint to use -r
tb wc -l -r 'projects/bms/*'	all files under each matched child directory + total
tb wc -l -r /projects/bms	whole subtree + total
RPC glob → one file	flat { lines: … } (not batch)
RPC glob → two or more files	{ files: [...], total: {...} }

Defaults: no flags → GNU columns lines, words, bytes. -c = UTF-8 byte length (POSIX); -m = Unicode scalar count.

API notes

• Backward compatible: document_wc() without metric flags still returns all four fields in a flat object.
• MCP: WcArg with optional booleans; explicit false is not sent on the wire.
• ACL: glob checks check_read(parent) first, then per-file check_read (fail-fast on first denial).
• Performance (Stage 1): N resolved files ⇒ N full body reads via document_wc. Design note in Tabularium KB: /projects/tabularium/design/wc-performance.md.