MCP++ Sessions 81–84: Complete API surface for MergeResult, IPFSReloadResult, PubSubBus, ComplianceChecker

[Copilot]

Incremental build-out of the MCP++ spec across four sessions (81–84), adding 168 new tests and completing the primary API surface for four core mcp_server modules.

MergeResult (ucan_delegation.py) — full dict protocol

• __iter__ — yields (key, value) pairs
• keys() + __getitem__ — required pair; keys() alone breaks dict(result) since Python's mapping protocol needs subscript support
• values() — [added_count, conflict_count, revocations_copied]
• items() — list(__iter__()), completing the trio; dict(r.items()) == dict(r)

IPFSReloadResult (nl_ucan_policy.py) — iteration + flat access

• iter_failed() — (name, error) for None CIDs
• iter_succeeded() — (name, cid) complement
• iter_all() — yield from pin_results.items(); covers full batch
• as_dict() — dict(pin_results), flat shallow copy safe for JSON/mutation

PubSubBus (mcp_p2p_transport.py) — SID-level introspection + dashboard helpers

• subscriber_ids(topic) — sorted SID list per topic
• topic_sid_map() — {topic: sorted_sid_list} mapping
• total_subscriptions() — len(_sid_map); counts registrations, not unique handlers
• topics_with_count() — [(topic, count)] sorted by subscriber count descending

ComplianceChecker (compliance_checker.py) — backup name utilities

• backup_summary(path) — {count, newest, oldest, newest_age, oldest_age}
• backup_names(path) — basenames only, path-safe for logging
• newest_backup_name(path) / oldest_backup_name(path) — basename of primary/oldest .bak or None
• Bug fix: removed duplicate dead-code block in backup_summary (unreachable copy after return)

# MergeResult now supports full dict protocol
r = MergeResult(added_count=3, conflict_count=1, revocations_copied=0)
dict(r)          # {"added_count": 3, "conflict_count": 1, "revocations_copied": 0}
r.items()        # [("added_count", 3), ("conflict_count", 1), ("revocations_copied", 0)]

# IPFSReloadResult unified batch reporting
for name, cid in result.iter_all():
    status = "ok" if cid else "FAILED"

# PubSubBus dashboard view
for topic, count in bus.topics_with_count():   # sorted highest-first
    ...

# ComplianceChecker backup introspection
ComplianceChecker.newest_backup_name("/data/rules.enc")  # "rules.enc.bak" or None
ComplianceChecker.oldest_backup_name("/data/rules.enc")  # "rules.enc.bak.2" or None

Four session plan docs (MASTER_IMPROVEMENT_PLAN_2026_v37–v40.md) track progress and define next steps.

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