0.5.8 - CORE rule promotions, taxonomy reconciliation, payload compaction,and cross-agent matching fix

[cleverhoods]

Summary

0.5.8 is largely an internal-quality release: rule taxonomy reconciliation, a wire-payload compaction pass that closes a class of payload-size 4xx the product was hitting
in beta, and a fix for cross-agent rule matching that silently skipped enforcement on every promoted rule.

What's in

Rule taxonomy reconciliation (5 promotions, 1 revert, 1 supersession bundle)

• Promoted to CORE (cross-agent rules, with per-agent supersedes where docs differ):
  • skill-no-readme → CORE:S:0035
  • skill-name-matches-directory → CORE:S:0036
  • skill-description-length → CORE:S:0040
  • import-depth-within-limit → CORE:S:0033 (CLAUDE:S:0010 supersedes with 5-hop limit, CURSOR:S:0002 supersedes with single-level limit, Codex/Copilot opt out via
    excludes:, Gemini inherits)
• Reverted memory-file promotion — Claude is the only agent with a dedicated MEMORY.md file the rule's match: {type: memory} can check. The other agents have
  section-of-file (Gemini), system-managed (Copilot), or undocumented memory mechanics. Rule stays in CLAUDE namespace as CLAUDE:S:0011 memory-file-within-size-limit.
• Slug rename — copilot/applyto-scope-declared → copilot/path-scope-declared for consistency with the cross-agent path-scope-declared family (Claude paths:,
  Cursor globs:, Copilot applyTo:).
• Threshold + see_also tweaks — CLAUDE:S:0009 rule-snippet-length severity raised to low, threshold 100 → 200 lines, cross-references CORE:C:0044 topic-scatter
  and CORE:S:0019 single-topic-per-section for the rationale.

Bandwidth + payload caps

• New core/payload.py module producing a compact wire payload for HTTP transport. Reduces request body size on large projects.
• New WIRE_MAX_BYTES_BY_TIER table and preflight_byte_size() in core/funnel.py. Local preflight returns a payload_too_large FunnelError before transmission
  instead of an opaque server-side 4xx.
• core/api_client.py _lint_remote switched to the compact wire format by default.

Discovery + classification fixes (already committed early in branch, included for completeness)

• core/agent_discovery.py — surfaces.<agent>.<file_type>.exclude patterns now apply across every surface of the agent. Previously cursor.rules and
  cursor.bugbot_rules (which both glob .cursor/rules/**/*.mdc) needed independent excludes; now any exclude declared anywhere for the agent applies globally.
• formatters/text/scorecard.py — compute_surface_scores relativizes ruleset_map.files[*].path against the project root before classification. Single root CLAUDE.md
  no longer renders as Main (1) ... Nested (1).

Misc

• mcp/server.py — example coordinate in the explain tool description updated from a renamed rule to a stable one.
• framework/rules/core/skill-{no-readme,name-matches-directory,directory-kebab-case}/rule.md — source: URL switched from code.claude.com to
  agentskills.io/specification (open standard is the canonical reference for skill conventions).
• .shared/knowledge/changelog.md — orphan file removed.