Add [all] sentinel to bc-version; apply to version-agnostic knowledge

Most of the corpus — FindSet/SetLoadFields/CalcFields patterns, permission
sets, SingleInstance codeunits, DataClassification, IsolatedStorage,
transaction scope, SecretText — describes BC platform behaviour that is
identical across supported versions. The seed [26..28] range on every
file implied a version-specificity the content does not actually have,
and there was no way to express "applies to every version" in the
schema the way [w1] and [all] already do for countries and
application-area.

Extend the v1 schema with a universal sentinel for bc-version, parallel
to the sentinels already defined for the other dimensions:

  bc-version: [all]         # applies to every BC version

[all] is mutually exclusive with explicit versions. Range shorthand
([26..28]) and explicit lists ([26, 27, 28]) continue to work for files
genuinely tied to a version-gated API or deprecation.

Update read.md (field definition, matching semantics, partial-context
rule), write.md (default to [all], use ranges only with a concrete
reason), README.md (frontmatter example), and the CI validator. All
forty existing knowledge files and the three action skills convert to
[all]; none of the current content is version-gated. Validator passes.

microsoft/knowledge/performance/add-sift-keys-for-flowfields.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [sift, sumindexfields, flowfield, key, aa0232]
 technologies: [al]

microsoft/knowledge/performance/avoid-calcfields-in-loops.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [calcfields, flowfield, loop, n-plus-one]
 technologies: [al]

microsoft/knowledge/performance/avoid-commit-inside-loops.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [commit, loop, transaction, lock]
 technologies: [al]

microsoft/knowledge/performance/avoid-findfirst-with-next.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [findfirst, findlast, get, next, aa0233]
 technologies: [al]

microsoft/knowledge/performance/avoid-user-interaction-in-transactions.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [confirm, strmenu, message, transaction, dialog]
 technologies: [al]

microsoft/knowledge/performance/filter-before-find.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [filter, setrange, setfilter, findset, scan]
 technologies: [al]

microsoft/knowledge/performance/keep-event-subscribers-lightweight.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [event, subscriber, publisher, extension]
 technologies: [al]

microsoft/knowledge/performance/only-fetch-records-you-use.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [findset, get, aa0175, wasted-fetch, read]
 technologies: [al]

microsoft/knowledge/performance/prefer-direct-record-over-recordref.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [recordref, fieldref, dynamic, reflection]
 technologies: [al]

microsoft/knowledge/performance/prefer-get-for-primary-key-lookups.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [get, findfirst, primary-key, lookup]
 technologies: [al]

microsoft/knowledge/performance/set-current-key-to-match-filters.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [setcurrentkey, key, index, sort, filter]
 technologies: [al]

microsoft/knowledge/performance/use-addloadfields-in-report-layouts.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [report, addloadfields, ondatapreitem, layout, partial-record]
 technologies: [al]

microsoft/knowledge/performance/use-calcsums-for-flowfield-totals.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [calcsums, sift, sum, aggregate, totals]
 technologies: [al]

microsoft/knowledge/performance/use-findset-readonly-by-default.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [findset, lock, locktable, readonly, update]
 technologies: [al]

microsoft/knowledge/performance/use-findset-with-next.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [findset, next, repeat, iteration, aa0181]
 technologies: [al]

microsoft/knowledge/performance/use-insert-false-when-skipping-triggers.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [insert, modify, delete, triggers, parameters]
 technologies: [al]

microsoft/knowledge/performance/use-isempty-for-existence-checks.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [isempty, count, findfirst, existence]
 technologies: [al]

microsoft/knowledge/performance/use-setloadfields-for-partial-records.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [setloadfields, partial-record, blob, bandwidth]
 technologies: [al]

microsoft/knowledge/performance/use-single-instance-codeunits-for-caching.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [singleinstance, cache, codeunit, session]
 technologies: [al]

microsoft/knowledge/performance/use-temporary-tables-for-intermediate-data.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: performance
 keywords: [temporary-table, in-memory, intermediate, working-set]
 technologies: [al]

microsoft/knowledge/security/compose-secrets-with-secretstrsubstno.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [secretstrsubstno, secrettext, composition]
 technologies: [al]

microsoft/knowledge/security/do-not-expose-sensitive-data-in-event-publishers.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [event, publisher, extensibility, var-parameter]
 technologies: [al]

microsoft/knowledge/security/follow-least-privilege-in-permission-sets.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [permissionset, least-privilege, rimd, tabledata]
 technologies: [al]

microsoft/knowledge/security/never-hardcode-secrets-in-al.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [secrets, credentials, hardcoded, label, apikey]
 technologies: [al]

microsoft/knowledge/security/prefer-azure-key-vault-for-production-secrets.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [keyvault, azure, secrets, rotation, audit]
 technologies: [al]

microsoft/knowledge/security/use-indirect-permissions-for-elevated-access.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [indirect-permission, elevation, permissionset]
 technologies: [al]

microsoft/knowledge/security/use-inherent-permissions-to-grant-minimal-access.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [inherentpermissions, attribute, least-privilege]
 technologies: [al]

microsoft/knowledge/security/use-isolated-storage-for-module-and-company-secrets.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [isolatedstorage, encryption, datascope, secrets]
 technologies: [al]

microsoft/knowledge/security/use-nondebuggable-when-parsing-secrets.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [nondebuggable, secrettext, attribute, parse]
 technologies: [al]

microsoft/knowledge/security/use-secrettext-for-credentials.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [secrettext, credentials, debugger, type]
 technologies: [al]

microsoft/knowledge/security/use-secrettext-with-httpclient.md

@@ -1,5 +1,5 @@
 ---
-bc-version: [26..28]
+bc-version: [all]
 domain: security
 keywords: [httpclient, secrettext, headers, uri]
 technologies: [al]