Add BCR-2026-005: General Assertion Predicates

[ChristopherA]

Proposes Known Values for general-purpose assertion lifecycle management in Gordian Envelopes.

Predicates defined:

• supersedes — Links a new assertion to the one it replaces
• revocationReason — Documents why an assertion was revoked
• processDisclosure — Narrative about how the assertion was produced
• disclosedBias — Potential biases the attestor discloses
• disclosedLimitations — Limitations on the attestor's knowledge
• assertionLimitations — Scope or constraints of the assertion itself

Codepoints: Community range 1000-1005

Complements existing core predicates validFrom (21) and validUntil (22).

Seeking rough consensus; willing to use 100000+ range if community prefers.

[shannona]

LGTM.

[ChristopherA]

Updates (Feb 4, 2026)

1. Notation: Changed CID(...) → Digest(...) per Issue BCR notation question: Content-addressed envelope references in examples #157 resolution

[ChristopherA]

⚠️ BLOCKED

This PR is blocked pending resolution of Issue #159 (Core Structural Predicates).

The supersedes predicate (1000) may need to move to a core structural predicates BCR if the community determines it belongs with other Digest-range-only predicates (derivedFrom, includes, reveals, about).

Awaiting @wolfmcnally's input on Issue #159 before finalizing codepoint allocation.

[ChristopherA]

Per Wolf's feedback: removed { } envelope wrapping from examples that don't include signatures. Wrapping is only needed when showing signed envelopes.

[ChristopherA]

✅ UNBLOCKED

The supersedes predicate has been removed from this BCR and will be defined in a future structural predicates BCR (Issue #159).

BCR-2026-005 now defines 5 predicates (1001-1005):

• revocationReason
• processDisclosure
• disclosedBias
• disclosedLimitations
• assertionLimitations

This PR is ready for review.

[ChristopherA]

Updated cross-references to reflect BCR suite renumbering. This BCR number (005) unchanged.