feat(ogar-vocab): add OpenProject Member alias for project_membership

[AdaWorldAPI]

What

Adds Member as an OpenProject alias for PROJECT_MEMBERSHIP (0x0108), keeping Membership as a deprecated synonym. Both names resolve to the same canonical id — purely additive.

("Member",     PROJECT_MEMBERSHIP),  // canonical (matches OP corpus + Redmine)
("Membership", PROJECT_MEMBERSHIP),  // deprecated synonym, kept for backcompat

Why

The earlier OpenProject alias was Membership — pre-snapshot prose. The engine-walking corpus snapshot in openproject-nexgen-rs op-canon (extracted from the real OpenProject Rails source via ruff_ruby_spo::extract_app_with) carries Member — the same name Redmine ships (both forks ship the membership join row as Member). The OGAR alias was therefore guessing the surface name; the actual canonical surface is Member.

Closes a self-pinned drift

openproject-nexgen-rs#56 added a deliberately-flipping test, port_and_snapshot_membership_vocab_mismatch_is_known, that asserts:

// KNOWN GAP: the port aliases this concept as `Membership`, not `Member`.
assert_eq!(class_id_of("Member"), None,
    "if this is now Some(_), OGAR aligned the alias to the corpus name —      update the OPENPROJECT_ALIASES follow-up and remove this pin");

Once op-canon bumps its ogar-vocab git pin after this lands, the pin self-fails by design — reminding the next session to drop it in a tiny op-canon follow-up.

Scope

• OPENPROJECT_ALIASES: +1 row (Member); Membership retained.
• OP↔RM convergence pair in tests: ("Membership", "Member", PROJECT_MEMBERSHIP) → ("Member", "Member", PROJECT_MEMBERSHIP) (canonical pair; convergence passes either way).
• each_port_has_expected_alias_count: OpenProject count 27 → 28; comment updated to name the deprecated synonym row.
• New focused test: openproject_member_and_membership_both_resolve_to_project_membership — pins the additive contract (both names → same id; OP Member ↔ RM Member converge).

Build

• Toolchain 1.95. cargo test -p ogar-vocab --lib ports:: → 28 passed (+1 new). cargo check --workspace --all-targets clean.
• No public API change.

Cross-refs

• openproject-nexgen-rs feat(ogar-vocab): agnostic vocab — Inheritance + domain tag + synergies #56 — the pinned drift-guard this fix closes.
• The follow-up op-canon PR (drops the pin) lands after this merges.

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