feat(docs): man pages for gasm and every command, guarded against CLI drift

Assisted-by: GLM 5.3 Flash

docs/man/gasm-parse.1

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+.TH GASM-PARSE 1 "2026-09-19" "gasm 0.33.0" "User Commands"
+.SH NAME
+gasm-parse \- parse an assembly file and report syntax errors
+.SH SYNOPSIS
+.B gasm parse <file>
+.SH DESCRIPTION
+Parse FILE and report syntax errors on stderr.  The parser is
+error-tolerant and line-oriented: a malformed line becomes a diagnostic
+and parsing continues, so one run reports every syntax error in the
+file rather than the first.
+.PP
+On success, print how many declarations and TEXT functions the file
+contains.  FILE may be
+.B \-
+to read standard input.
+.SH EXIT STATUS
+Exits 0 when the file parses without errors and 1 otherwise.
+.SH SEE ALSO
+.BR gasm (1),
+.BR gasm\-tokens (1)